Handle images that do not have data-width or data-height

[audiodude]

Fixes #2113

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 11 lines in your changes missing coverage. Please review.

Project coverage is 75.24%. Comparing base (1763a23) to head (5b00f29).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/renderers/wikimedia-mobile.renderer.ts	66.66%	10 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2114      +/-   ##
==========================================
- Coverage   75.43%   75.24%   -0.20%     
==========================================
  Files          41       41              
  Lines        3188     3195       +7     
  Branches      703      706       +3     
==========================================
- Hits         2405     2404       -1     
- Misses        666      674       +8     
  Partials      117      117              

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