File size check incomplete

[kdambekalns]

As per the comment this checks for the original or optimized files being empty:

Sitegeist.Iconoclasm/Classes/Service/ThumbnailOptimizationService.php

Line 102 in 0adc121

if ($filesizeOriginal === false || $filesizeOptimized === false) {

But the strict check only handles errors, not the file being empty… This leads to empty files being used happily:

Optimized image "…-305-7952x4473.jpg" with command "…" reduction 603.24 KB > 0.00 B bytes - reduction 100.00 %