feat: fallback invalid image

[ykzts]

No description provided.

[codecov]

Codecov Report

Merging #172 into master will increase coverage by 0.38%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #172      +/-   ##
=========================================
+ Coverage   87.02%   87.4%   +0.38%     
=========================================
  Files           5       5              
  Lines         131     135       +4     
=========================================
+ Hits          114     118       +4     
  Misses          9       9              
  Partials        8       8

Impacted Files	Coverage Δ
convert.go	76.31% <100%> (ø)	⬆️
transport.go	86.2% <100%> (+1.02%)	⬆️

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