fix BUG-141, crashing pa_job_manager when transforming a non-Image

pa_job_manager.py

@@ -1897,6 +1897,11 @@ def JobTransformImage(job):
     amt=[jex.value for jex in job.extra if jex.name == "amt"][0]
     e=session.query(Entry).join(File).filter(Entry.id==id).first()
     PAprint( f"JobTransformImage: job={job.id}, id={id}, amt={amt}" )
+    # cant transfer non-image, but may get here if multi-select includes non-Image
+    if e.type.name != 'Image':
+        removeEntryAmendment( job, id )
+        FinishJob(job, "Cannot rotate file as it is not an Image","Failed")
+        return
 
     if amt == "fliph":
         AddLogForJob(job, f"INFO: Flipping {e.FullPathOnFS()} horizontally" )