Bug 1822062 - avoid sending NotifyVisited IPCs with no URIs, r=emilio.

Differential Revision: https://phabricator.services.mozilla.com/D172688

docshell/base/BaseHistory.cpp

@@ -216,7 +216,9 @@ void BaseHistory::SendPendingVisitedResultsToChildProcesses() {
         resultsForProcess.AppendElement(result.mResult);
       }
     }
-    Unused << NS_WARN_IF(!cp->SendNotifyVisited(resultsForProcess));
+    if (!resultsForProcess.IsEmpty()) {
+      Unused << NS_WARN_IF(!cp->SendNotifyVisited(resultsForProcess));
+    }
   }
 }