Allow PDF pane to accept bytes

[philippjfr]

The _imgshape method is used to determine if the bytes value is valid. We implement it but do not use the returned value.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 87.08%. Comparing base (706cd7e) to head (77dc75a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
panel/pane/image.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8044      +/-   ##
==========================================
+ Coverage   86.06%   87.08%   +1.01%     
==========================================
  Files         346      346              
  Lines       53734    53738       +4     
==========================================
+ Hits        46248    46799     +551     
+ Misses       7486     6939     -547     

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[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.