Merge pull request #324 from rstudio/bcwu-redeploy2unknown

allow redeployment to unknown app mode

Author: bcwu

rsconnect/api.py

@@ -852,7 +852,7 @@ def validate_app_mode(self, *args, **kwargs):
                     existing_app_mode = AppModes.get_by_cloud_name(app.json_data["mode"])
                 else:
                     raise RSConnectException("Unable to infer Connect client.")
-            if existing_app_mode and app_mode != existing_app_mode:
+            if existing_app_mode and existing_app_mode not in (None, AppModes.UNKNOWN, app_mode):
                 msg = (
                     "Deploying with mode '%s',\n"
                     + "but the existing deployment has mode '%s'.\n"