diff --git a/modules/aeolus/aeolus_amv.py b/modules/aeolus/aeolus_amv.py
index 989948423510a68b697b9dc4075a8e9a12880105..b30c26c54dd1fed097db5a1fdf0fcb048e31bb8a 100644
--- a/modules/aeolus/aeolus_amv.py
+++ b/modules/aeolus/aeolus_amv.py
@@ -37,10 +37,10 @@ class AMVFiles:
             self.ftimes.append((dto_start.timestamp(), dto_end.timestamp()))
 
     def get_datetime(self, pathname):
-        return None
+        pass
 
     def get_navigation(self):
-        return None
+        pass
 
     def get_file_containing_time(self, timestamp):
         k = -1
@@ -54,13 +54,13 @@ class AMVFiles:
         return self.flist[k], self.ftimes[k], k
 
     def get_parameters(self):
-        raise MyGenericException('must implement get_parameters in subclass')
+        pass
 
     def get_out_parameters(self):
-        raise MyGenericException('must implement get_out_parameters in subclass')
+        pass
 
     def get_meta_dict(self):
-        raise MyGenericException('must implement get_meta_dict in subclass')
+        pass
 
 
 class Framework(AMVFiles):