more of guards for 502 (or any 5xx error really) needed

[yarikoptic]

a fresh run failed for /mnt/backup/dandi/tinuous-logs/dandi-api on drogon

2022-04-18T10:10:02-0400 [INFO    ] tinuous tinuous 0.5.1                                                                                                                                                            
2022-04-18T10:10:02-0400 [INFO    ] tinuous Fetching resources from github                                                                                                                                           
2022-04-18T10:10:02-0400 [INFO    ] tinuous Fetching runs newer than 2022-03-16 15:52:15+00:00                                                                                                                       
2022-04-18T10:10:02-0400 [INFO    ] tinuous Fetching runs for workflow .github/workflows/cli-integration.yml (Test Integration with dandi-cli)                                                                       
Traceback (most recent call last):                                                                                                                                                                                   
  File "/mnt/backup/dandi/tinuous-logs/venv/bin/tinuous", line 10, in <module>                                                                                                                                       
    sys.exit(main())                                                                                                                                                                                                 
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/click/core.py", line 1128, in __call__                                                                                                       
    return self.main(*args, **kwargs)                                                                                                                                                                                
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/click/core.py", line 1053, in main                                                                                                           
    rv = self.invoke(ctx)                                                                                                                                                                                            
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/click/core.py", line 1659, in invoke                                                                                                         
    return _process_result(sub_ctx.command.invoke(sub_ctx))                                                                                                                                                          
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/click/core.py", line 1395, in invoke                                                                                                         
    return ctx.invoke(self.callback, **ctx.params)                                                                                                                                                                   
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/click/core.py", line 754, in invoke                                                                                                          
    return __callback(*args, **kwargs)                                                                                                                                                                               
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/click/decorators.py", line 38, in new_func                                                                                                   
    return f(get_current_context().obj, *args, **kwargs)                                                                                                                                                             
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/tinuous/__main__.py", line 112, in fetch                                                                                                     
    for obj in ci.get_build_assets(                                                                                                                                                                                  
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/tinuous/github.py", line 125, in get_build_assets                                                                                            
    for run in self.get_runs(wf, self.since):                                                                                                                                                                        
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/tinuous/github.py", line 42, in wrapped                                                                                                      
    return func(gha, *args, **kwargs)                                                                                                                                                                                
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/tinuous/github.py", line 108, in get_runs                                                                                                    
    for r in wf.get_runs():                                                                                                                                                                                          
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/github/PaginatedList.py", line 56, in __iter__                                                                                               
    newElements = self._grow()                                                                                                                                                                                       
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/github/PaginatedList.py", line 67, in _grow                                                                                                  
    newElements = self._fetchNextPage()                                                                                                                                                                              
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/github/PaginatedList.py", line 199, in _fetchNextPage                                                                                        
    headers, data = self.__requester.requestJsonAndCheck(                                                                                                                                                            
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/github/Requester.py", line 353, in requestJsonAndCheck                                                                                       
    return self.__check(                                                                                                                                                                                             
  File "/mnt/backup/dandi/tinuous-logs/venv/lib/python3.8/site-packages/github/Requester.py", line 378, in __check                                                                                                   
    raise self.__createException(status, responseHeaders, output)                                                                                                                                                    
github.GithubException.GithubException: 502 {"message": "Server Error"}