PythonShell broken by any custom filter

Having a custom filter in the settings break the PythonShell.

Steps to reproduce:

• Open ParaView
• Wavelet, Apply
• Tools -> CreateCustomFilter
• Give it a name, next, next, next, next, finish
• View -> PythonShell
• Click in the python shell

[glow@gamma ~/work/paraview/pv1/build]$ ./bin/paraview
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/home/glow/work/paraview/pv1/build/lib/python3.9/site-packages/paraview/simple.py", line 2918, in <module>
    _add_functions(globals())
  File "/home/glow/work/paraview/pv1/build/lib/python3.9/site-packages/paraview/simple.py", line 2752, in _add_functions
    for key in dir(m):
  File "/home/glow/work/paraview/pv1/build/lib/python3.9/site-packages/paraview/servermanager.py", line 2703, in __dir__
    s.add(self._getPyName(xml=item["xml"]))
  File "/home/glow/work/paraview/pv1/build/lib/python3.9/site-packages/paraview/servermanager.py", line 2681, in _getPyName
    assert name
AssertionError

FYI @nicolas.vuaille