Publish report viewer: Handle case if report is None

[iLLiCiTiT]

Changelog Description

Handle report being None when cheching for blocking crashed paths.

Traceback

Traceback (most recent call last):
  File "C:\Users\user\Desktop\Prace\ayon\ayon-core\client\ayon_core\tools\publisher\publish_report_viewer\window.py", line 642, in _on_report_change
    self.set_report(report)
  File "C:\Users\user\Desktop\Prace\ayon\ayon-core\client\ayon_core\tools\publisher\publish_report_viewer\window.py", line 638, in set_report
    self._main_widget.set_report(report_data)
  File "C:\Users\user\Desktop\Prace\ayon\ayon-core\client\ayon_core\tools\publisher\publish_report_viewer\widgets.py", line 891, in set_report
    if report.blocking_crashed_paths:
AttributeError: 'NoneType' object has no attribute 'blocking_crashed_paths'

Testing notes:

1. Publish report viewer does not crash on refresh.

[BigRoy]

Publish report viewer does not crash on refresh.

How do you force a refresh? :D Or what refresh do we mean?

[iLLiCiTiT]

How do you force a refresh? :D Or what refresh do we mean?

I don't know, I saw the error and find out: Hey, it can be None, I didn't know... I guess it happens either when window is opened first time, or on refresh which fails for some reason...

[BigRoy]

I'll let @m-u-r-p-h-y review since he reported it and seemed he was able to produce the error previously.

Bonus points @m-u-r-p-h-y for explaining here when exactly it occurred ;)