Only include federated shares if the domains list is not empty

webapp_column_left.py

@@ -38,6 +38,8 @@ def _getLeftColumnShares(baseDir: str,
     """
     pageNumber = 1
     actor = httpPrefix + '://' + domainFull + '/users/' + nickname
+    # NOTE: this could potentially be slow if the number of federated
+    # shared items is large
     sharesJson, lastPage = \
         sharesTimelineJson(actor, pageNumber, maxSharesInLeftColumn,
                            baseDir, maxSharesInLeftColumn,

webapp_utils.py

@@ -362,6 +362,7 @@ def sharesTimelineJson(actor: str, pageNumber: int, itemsPerPage: int,
                 if ctr >= maxSharesPerAccount:
                     break
         break
+    if sharedItemsFederatedDomains:
         catalogsDir = baseDir + '/cache/catalogs'
         if os.path.isdir(catalogsDir):
             for subdir, dirs, files in os.walk(catalogsDir):