Merge branch 'fix/RED-7388-nack-message-if-processing-failure' into 'master'

Adjust error handling of processing sub-process

Closes RED-7388

See merge request redactmanager/image-classification-service!4

image_prediction/utils/process_wrapping.py

@@ -17,9 +17,6 @@ def wrap_in_process(fn):
         process = multiprocessing.Process(target=process_fn, args=args, kwargs=kwargs)
         process.start()
         process.join()
-        try:
-            return return_queue.pop(0)
-        except IndexError:
-            logger.warning("No results returned by subprocess.")
+        return return_queue.pop(0)
 
     return wrapped_fn