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pvbatch and catalyst complain type object 'PNG' has no attribute 'MetaData' if you add any metadata to the PNG writer in the extract properties. To recreate:

• load a data set and show surface
• create a PNG extract
• in properties panel, in image options, add a second line: user, me
• save catalyst state - pick a script name
• run the saved script with pvbatch

Below shows two scripts, the first one I saved without making a change to the image properties, it works. The second one I created by changing the user prorperties, it fails with MetaData error.

`pn1933613:~ patchett$ diff pvhead_catalyststate3.py pvhead_catalyststate4.py
96a97,99
> # init the 'PNG' selected for 'Format'
> pNG1.Writer.Format.MetaData = ['Application', 'ParaView', 'user', 'patchett']
> 
pn1933613:~ patchett$ 
pn1933613:~ patchett$ /Applications/ParaView-5.9.0-858-gca61cc8736.app/Contents/bin/pvbatch pvhead_catalyststate3.py 
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
pn1933613:~ patchett$ /Applications/ParaView-5.9.0-858-gca61cc8736.app/Contents/bin/pvbatch pvhead_catalyststate4.py 
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Traceback (most recent call last):
  File "/Applications/ParaView-5.9.0-858-gca61cc8736.app/Contents/Python/paraview/servermanager.py", line 479, in __setattr__
    setter = getattr(self.__class__, name)
AttributeError: type object 'PNG' has no attribute 'MetaData'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Applications/ParaView-5.9.0-858-gca61cc8736.app/Contents/Python/paraview/servermanager.py", line 485, in __setattr__
    _bc.setattr(self, name, value)
  File "/Applications/ParaView-5.9.0-858-gca61cc8736.app/Contents/Python/paraview/_backwardscompatibilityhelper.py", line 363, in setattr
    raise AttributeError()
AttributeError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "pvhead_catalyststate4.py", line 98, in <module>
    pNG1.Writer.Format.MetaData = ['Application', 'ParaView', 'user', 'patchett']
  File "/Applications/ParaView-5.9.0-858-gca61cc8736.app/Contents/Python/paraview/servermanager.py", line 492, in __setattr__
    raise AttributeError("Attribute %s does not exist. " % name +
AttributeError: Attribute MetaData 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.`
@utkarsh.ayachit @cory.quammen