fix broad-exception-caught

Author: xfz11

src/azure-cli/azure/cli/command_modules/serviceconnector/custom.py

@@ -14,6 +14,7 @@
     ValidationError,
     AzureResponseError
 )
+from azure.core.exceptions import ResourceNotFoundError
 from ._resource_config import (
     CLIENT_TYPE,
     SUPPORTED_AUTH_TYPE,
@@ -545,9 +546,9 @@ def connection_create_func(cmd, client,  # pylint: disable=too-many-locals,too-m
                 logger.warning(
                     'Connection exists and no property to be updated, skip the update operation.')
                 return linker
-        except Exception as e:
-            logger.debug('No existing connection, start creating a new one. Error: %s', e)
-
+        except ResourceNotFoundError as e:
+            logger.debug('No existing connection, continue to create it.')
+        
     if enable_mi_for_db_linker and auth_action != 'optOutAllAuth':
         new_auth_info = enable_mi_for_db_linker(
             cmd, source_id, target_id, auth_info, client_type, connection_name, connstr_props)