Fix AttributeError exception seen when testing 201911 image. (#4178)

201911 does not require loading of database config.
Add the right exception so that the exception of load db
config can be ignored for 201911 image.

Signed-off-by: Suvarna Meenakshi <sumeenak@microsoft.com>

Author: SuvarnaMeenakshi

ansible/module_utils/multi_asic_utils.py

@@ -20,3 +20,5 @@ def load_db_config():
         pass
     except NameError:
         pass
+    except AttributeError:
+        pass