[Fix] MJSynth dataset: filter corrupted or missing images

[felixdittrich92]

This PR:

• filter corrupted or missing images

Any feedback is welcome 🤗

Please merge #954 before this one :)

[codecov]

Codecov Report

Merging #956 (93e9400) into main (210ecc4) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #956      +/-   ##
==========================================
- Coverage   94.83%   94.82%   -0.02%     
==========================================
  Files         134      134              
  Lines        5539     5541       +2     
==========================================
+ Hits         5253     5254       +1     
- Misses        286      287       +1     

Flag	Coverage Δ
unittests	94.82% <100.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
doctr/datasets/mjsynth.py	95.83% <100.00%> (+0.37%)	⬆️
doctr/transforms/functional/base.py	95.65% <0.00%> (-1.45%)	⬇️
doctr/transforms/modules/base.py	94.59% <0.00%> (ø)

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[frgfm]

Thanks Felix :)