Patch us-east-1 detection based on extra conditions.

Author: aemous

awscli/customizations/globalargs.py

@@ -133,11 +133,12 @@ def detect_migration_breakage(parsed_args, remaining_args, session, **kwargs):
                 out_file=sys.stderr
             )
     if (
-            (s3_config is None or (
-                s3_config is not None and s3_config.get(
-                    'us_east_1_regional_endpoint',
-                    'legacy'
-                ) == 'legacy')) and region in ('us-east-1', None)
+            (
+                s3_config is None
+                or s3_config.get('us_east_1_regional_endpoint', 'legacy')
+                == 'legacy'
+            )
+            and region in ('us-east-1', None)
             and parsed_args.endpoint_url is None
     ):
         session.register(