Add an alternative scenario to EoMT `post_process_semantic_segmentation` in case `path_offsets` is None (#42716)
* Add an alternative scenario in case patch_offsets is None
* Fixup
* Fix an error
* Simplified the function
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Co-authored-by: Yoni Gozlan <74535834+yonigozlan@users.noreply.github.com>