[gnome-shell] appDisplay: Don't crash if app is missing categories

[Florian Müllner <fmuellner src gnome org>]

commit 0732e1426a6cc0fe50a7fdb84d4b633faba3dbe8
Author: Philip Chimento <philip endlessm com>
Date:   Fri Oct 25 15:27:25 2019 -0700

    appDisplay: Don't crash if app is missing categories
    
    g_desktop_app_info_get_categories() may return null. In that case, the
    previous code would fail to create a folder when dragging an app with
    no categories onto another app. Instead, simply continue with the next
    app info.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/782

 js/ui/appDisplay.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/js/ui/appDisplay.js b/js/ui/appDisplay.js
index 79c2f7e83a..68dbb7f871 100644
--- a/js/ui/appDisplay.js
+++ b/js/ui/appDisplay.js
@@ -98,7 +98,10 @@ function _findBestFolderName(apps) {
     let commonCategories = [];
 
     appInfos.reduce((categories, appInfo) => {
-        for (let category of appInfo.get_categories().split(';')) {
+        const appCategories = appInfo.get_categories();
+        if (!appCategories)
+            return categories;
+        for (let category of appCategories.split(';')) {
             if (!(category in categoryCounter))
                 categoryCounter[category] = 0;