Length of either side cannot be 0 or negative, current size is 2x0

[Martin Auswöger]

See https://community.contao.org/de/showthread.php?81203

If a small image gets resized with a very wide aspect ratio the calculated height might end up being zero. This is invalid as there are no images with 0 height or width.

I think we should force a minimum width/height of 1 in

image/src/ResizeCalculator.php

Lines 225 to 238 in fcfda96

 return new ResizeCoordinates( 
     new Box( 
         (int) round($size[0] * $scale), 
         (int) round($size[1] * $scale) 
     ), 
     new Point( 
         (int) round($cropStart[0] * $scale), 
         (int) round($cropStart[1] * $scale) 
     ), 
     new Box( 
         (int) round($cropSize[0] * $scale), 
         (int) round($cropSize[1] * $scale) 
     ) 
 );