Fix handling handling of 0-step denoising process #6544
Merged
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Summary
#6522 introduced a change in behavior in cases where start/end were set such that there are 0 timesteps. This PR reverts that change.
cc @StAlKeR7779
QA Instructions
Run with euler, 5 steps, start: 0.0, end: 0.05. I ran this test before #6522, after #6522, and on this branch. This branch restores the behavior to pre-#6522 i.e. noise is injected even if no denoising steps are applied.
Checklist