BUG: Python3: Fix initialization of PythonQt module #857
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This commit avoids the error "SystemError: initialization
of CTKPythonQt raised unreported exception"
from being reported when no PythonQt wrapper are associated
with .
As discussed in [1], " module init functions should
return NULL in order to communicate that an exception
occurred during initialization"
[1] numpy/numpy#10775 (comment)