fix(cache-invalidation): fixed case when empty repos once cached wouldn't invalidate caches because of empty case condition

rhodecode/model/db.py

@@ -2634,7 +2634,6 b' class Repository(Base, BaseModel):'
 
             previous_state_uid, instance = cache_func(*args)
 
-            if instance:
                 # now compare keys, the "cache" state vs expected state.
                 if previous_state_uid != cache_state_uid:
                     log.warning('Cached state uid %s is different than current state uid %s',
@@ -2652,6 +2651,7 b' class Repository(Base, BaseModel):'
             'cache': cache,  # controls the vcs.remote cache
             'repo_state_uid': repo_state_uid
         }
+
         repo = get_vcs_instance(
             repo_path=safe_str(self.repo_full_path),
             config=config,