handle delayed model loading in get_model_file_type

Author: jkamelin

tools/accuracy_checker/openvino/tools/accuracy_checker/launcher/dlsdk_launcher.py

@@ -931,7 +931,10 @@ def _set_preprocess(self, preprocess):
         self.disable_resize_to_input = preprocess.ie_processor.has_resize()
 
     def get_model_file_type(self):
-        return self._model.suffix
+        if self._delayed_model_loading:
+            return None
+        else:
+            return self._model.suffix
 
     def input_shape(self, input_name):
         if input_name in self._partial_shapes:

tools/accuracy_checker/openvino/tools/accuracy_checker/launcher/openvino_launcher.py

@@ -967,7 +967,10 @@ def _set_preprocess(self, preprocess):
         self.disable_resize_to_input = preprocess.ie_processor.has_resize()
 
     def get_model_file_type(self):
-        return self._model.suffix
+        if self._delayed_model_loading:
+            return None
+        else:
+            return self._model.suffix
 
     def get_infer_queue(self, log=True):
         if self.config.get('num_requests', 'AUTO') == 'AUTO':