Merge pull request #855 from MP2E/master

UI: Fix segfault when no system tray exists

UI/window-basic-main.cpp

@@ -2930,6 +2930,7 @@ void OBSBasic::changeEvent(QEvent *event)
 {
 	if (event->type() == QEvent::WindowStateChange &&
 	    isMinimized() &&
+	    trayIcon &&
 	    trayIcon->isVisible() &&
 	    sysTrayMinimizeToTray()) {