fix: initialize image_cond_mask to prevent UnboundLocalError in I2V #1874
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Problem
When running I2V with Fun 2.1 models (transformer.in_dim in [48, 32]), the mask assignment branch is skipped.
However,
image_cond_maskis referenced later, causing:UnboundLocalError: cannot access local variable 'image_cond_mask' where it is not associated with a value
Fix
Initialize
image_cond_mask = Nonebefore conditional assignment so it is always defined.This is a minimal change and does not alter behavior when a mask is provided.