fix: avoid black images if using an invalid VAE (for SDXL) #1273
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If we inadvertently provide an invalid VAE file (for example
--vae sdxl_invalid_vae.sft) we will get a black image later after some U-Net loops. This can happen due to typos, invalid symlinks etc. etc.So now we better act like using option
--force-sdxl-vae-conv-scale.