Fix possible pagination issue when a sync returns an empty limited timeline

src/timeline/TimelineModel.cpp

@@ -1162,12 +1162,12 @@ TimelineModel::syncState(const mtx::responses::State &s)
 void
 TimelineModel::addEvents(const mtx::responses::Timeline &timeline)
 {
-    if (timeline.events.empty())
-        return;
-
     if (timeline.limited)
         setPaginationInProgress(false);
 
+    if (timeline.events.empty())
+        return;
+
     events.handleSync(timeline);
 
     using namespace mtx::events;