watermark is broken

[matt-long]

Something in utils.py breaks watermark. I get the following error from the watermark magic.

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-173-35b364ad726b> in <module>
     12 
     13 get_ipython().run_line_magic('load_ext', 'watermark')
---> 14 get_ipython().run_line_magic('watermark', '-d -iv -m -g -h')

/glade/work/mclong/miniconda3/envs/cesm2-marbl/lib/python3.7/site-packages/IPython/core/interactiveshell.py in run_line_magic(self, magic_name, line, _stack_depth)
   2305                 kwargs['local_ns'] = sys._getframe(stack_depth).f_locals
   2306             with self.builtin_trap:
-> 2307                 result = fn(*args, **kwargs)
   2308             return result
   2309 

</glade/work/mclong/miniconda3/envs/cesm2-marbl/lib/python3.7/site-packages/decorator.py:decorator-gen-126> in watermark(self, line)

/glade/work/mclong/miniconda3/envs/cesm2-marbl/lib/python3.7/site-packages/IPython/core/magic.py in <lambda>(f, *a, **k)
    185     # but it's overkill for just that one bit of state.
    186     def magic_deco(arg):
--> 187         call = lambda f, *a, **k: f(*a, **k)
    188 
    189         if callable(arg):

/glade/work/mclong/miniconda3/envs/cesm2-marbl/lib/python3.7/site-packages/watermark/watermark.py in watermark(self, line)
    134                 self._get_git_branch(bool(args.machine))
    135             if args.iversions:
--> 136                 self._print_all_import_versions(self.shell.user_ns)
    137             if args.watermark:
    138                 if self.out:

/glade/work/mclong/miniconda3/envs/cesm2-marbl/lib/python3.7/site-packages/watermark/watermark.py in _print_all_import_versions(vars)
    248         longest = max([len(i[0]) for i in to_print] + [0]) + 1
    249         for entry in to_print:
--> 250             print(('%s' % entry[0]).ljust(longest) + entry[1])
    251 
    252 

TypeError: can only concatenate str (not "NoneType") to str