Enforce non-empty storage_namespace in judge handler

judge/bridge/judge_handler.py

@@ -237,15 +237,10 @@ def submit(self, id, problem, language, source):
         data = self.get_related_submission_data(id)
         self._working = id
         self._no_response_job = threading.Timer(20, self._kill_if_no_response)
-        if '/' in problem:
-            storage_namespace, problem = problem.split('/')
-        else:
-            storage_namespace = ''
-        self.send({
+        request = {
             'name': 'submission-request',
             'submission-id': id,
             'problem-id': problem,
-            'storage-namespace': storage_namespace,
             'language': language,
             'source': source if not data.file_only else get_absolute_submission_file_url(source),
             'time-limit': data.time,
@@ -259,7 +254,14 @@ def submit(self, id, problem, language, source):
                 'file-only': data.file_only,
                 'file-size-limit': data.file_size_limit,
             },
-        })
+        }
+        if '/' in problem:
+            storage_namespace, problem = problem.split('/')
+            request.update({
+                'storage-namespace': storage_namespace,
+                'problem-id': problem,
+            })
+        self.send(request)
 
     def _kill_if_no_response(self):
         logger.error('Judge failed to acknowledge submission: %s: %s', self.name, self._working)