add api stub for https://hyde.infosys.tuwien.ac.at/aic20/g4t2/-/issues/16;

middleware/app_be/views/rest_api.py

@@ -48,6 +48,12 @@ class ImageEndpoint:
         logger.debug('Image GET single call: {}'.format(request))
         return ImageEndpoint.get_image(identifier)
 
+    @staticmethod
+    @api_view(['GET'])
+    def image_api_get_status(request, identifier):
+        # TODO MARTIN
+        return JsonResponse({'valid': True, 'available': True})
+
     @staticmethod
     def get_image(identifier):