Export w/o input

[hexaclue]

A user should be able to export the image without an input image. This would mean that the exported image is just a pride flag.

Requirements:

• [x] A message above the export button saying that it is just the pride flag without any input.

[Yu-Vitaqua-fer-Chronos]

Wouldn't a simple solution be to just disable the check for an image? It'd just be a transparent input image by default when there's no uploaded images, since overlaying images already work like this when transparency is disabled, though I haven't looked into the source of the project yey