conversationmodel: emit sorted when necessary

Change-Id: Ib102e097287e923459cc2825ea6c2c5c739821fd

src/conversationmodel.cpp

@@ -1612,6 +1612,7 @@ ConversationModelPimpl::slotContactModelUpdated(const QString& uri, bool needsSo
 
     if (filter.isEmpty()) {
         if (searchResults.empty()) {
+            emit linked.modelSorted();
             return;
         }
         searchResults.clear();