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@utkarsh.ayachit @cory.quammen

Found this when fiddling with 5.9.1-RC1 and the image extracts. When saving an image extract and changing the compression level to 0, the resulting catalyst state file cannot be run due to the error AttributeError: Attribute CompressionLevel does not exist.

wavelet_png_extract.py

To reproduce:

1. Wavelet source -> Show surface -> color by RTData
2. Create PNG image extract, set compression level to 0
3. File -> Save Catalyst State (wavelet_png_extract.py)
4. pvbatch wavelet_png_extract.py

$ /Applications/ParaView-5.9.1-RC1.app/Contents/bin/pvbatch ./wavelet_png_extract.py 
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Traceback (most recent call last):
  File "/Applications/ParaView-5.9.1-RC1.app/Contents/Python/paraview/servermanager.py", line 479, in __setattr__
    setter = getattr(self.__class__, name)
AttributeError: type object 'PNG' has no attribute 'CompressionLevel'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Applications/ParaView-5.9.1-RC1.app/Contents/Python/paraview/servermanager.py", line 485, in __setattr__
    _bc.setattr(self, name, value)
  File "/Applications/ParaView-5.9.1-RC1.app/Contents/Python/paraview/_backwardscompatibilityhelper.py", line 335, in setattr
    raise AttributeError()
AttributeError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./wavelet_png_extract.py", line 136, in <module>
    pNG1.Writer.Format.CompressionLevel = '0'
  File "/Applications/ParaView-5.9.1-RC1.app/Contents/Python/paraview/servermanager.py", line 492, in __setattr__
    raise AttributeError("Attribute %s does not exist. " % name +
AttributeError: Attribute CompressionLevel does not exist.  This class does not allow addition of new attributes to avoid mistakes due to typos. Use add_attribute() if you really want to add this attribute.