Checking if RepositoryManager is null if cache events come in before

initialization

Author: StanleyGoldman

src/GitHub.Api/Git/Repository.cs

@@ -259,15 +259,15 @@ private void CacheContainer_OnCacheInvalidated(CacheType cacheType)
                     break;
 
                 case CacheType.GitLogCache:
-                    repositoryManager.UpdateGitLog();
+                    repositoryManager?.UpdateGitLog();
                     break;
 
                 case CacheType.GitStatusCache:
-                    repositoryManager.UpdateGitStatus();
+                    repositoryManager?.UpdateGitStatus();
                     break;
 
                 case CacheType.GitLocksCache:
-                    repositoryManager.UpdateLocks();
+                    repositoryManager?.UpdateLocks();
                     break;
 
                 case CacheType.GitUserCache: