Don't trigger the connection warning when there is no previous arrival time

src/app/timelinedelegatecontroller.cpp

@@ -531,7 +531,11 @@ bool TimelineDelegateController::connectionWarning() const
     const auto prevArrDt = std::max(SortUtil::endDateTime(prevRes), prevArr.expectedArrivalTime());
 
     const auto curDepDt = std::max(SortUtil::startDateTime(curRes), departure().expectedDepartureTime());
+    if (curDepDt.isValid() && prevArrDt.isValid()) {
         return curDepDt < prevArrDt;
+    }
+
+    return false;
 }
 
 bool TimelineDelegateController::isCanceled() const