unstructured

1ddf542e - fix: Don't call extractable_elements if strategy is ocr_only (#1160)

fix: Don't call extractable_elements if strategy is ocr_only (#1160) - fixes #1079 where partitioning is happening twice in the case of `strategy="ocr_only"` - only calls `extractable_elements` if we can predetermine that `ocr_only` is not a possible strategy even if it was the intended strategy. - Adds additional assertion test that `_partition_pdf_or_image_with_ocr` is not called when falling back to `fast` from `ocr_only`