Fix free highlight on pages without images (bug 2035530)

[calixteman]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.95%. Comparing base (34c3ee1) to head (e7ec356).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21196      +/-   ##
==========================================
+ Coverage   55.94%   55.95%   +0.01%     
==========================================
  Files         218      218              
  Lines       59062    59062              
==========================================
+ Hits        33043    33051       +8     
+ Misses      26019    26011       -8     

Flag	Coverage Δ
fonttest	8.66% <ø> (ø)
unittest	55.05% <ø> (+<0.01%)	⬆️
unittestcli	55.71% <ø> (+0.01%)	⬆️

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[timvandermeij]

Looks good; thank you!