Few github high cpu load fixes (#6865)

Signed-off-by: Andrey Sobolev <haiodo@gmail.com>

services/github/pod-github/src/sync/pullrequests.ts

@@ -971,6 +971,10 @@ export class PullRequestSyncManager extends IssueSyncManagerBase implements DocS
       return { needSync: githubSyncVersion }
     }
 
+    if (info.repository == null) {
+      return { needSync: githubSyncVersion }
+    }
+
     const pullRequestExternal = info.external as unknown as PullRequestExternalData
 
     if (info.externalVersion !== githubExternalSyncVersion) {