added try/except around conn.get_all_dbinstances

cloud/rds

@@ -463,8 +463,12 @@ def main():
     if command == 'delete' and not wait:
         module.exit_json(changed=True)
 
+    try: 
         instances = conn.get_all_dbinstances(instance_name)
         my_inst = instances[0]
+    except boto.exception.BotoServerError, e:
+        module.fail_json(msg = e.error_message)
+
 
     # Wait for the instance to be available if requested
     if wait: