Don't add apps which have no variants defined

src/freedombone-installer

@@ -96,12 +96,17 @@ function web_admin_create_add_apps {
         if [ ! $app_is_installed ]; then
             app_filename="/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-${app_name}"
             if [ -f "$app_filename" ]; then
+                if grep -q "VARIANTS=''" "$app_filename"; then
+                    continue
+                fi
+                if grep -q 'VARIANTS=""' "$app_filename"; then
+                    continue
+                fi
                 # get the icon for the app
                 icon_filename="/usr/share/${PROJECT_NAME}/android-app/${app_name}.png"
                 if [ -f "$icon_filename" ]; then
                     cp "$icon_filename" "$webadmin_install_dir/icons/${app_name}.png"
                 else
-                    icon_filename=
                     continue
                 fi
 

src/freedombone-utils-webadmin

@@ -244,6 +244,12 @@ function web_admin_create_add_apps {
         if [ ! $app_is_installed ]; then
             app_filename="/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-${app_name}"
             if [ -f "$app_filename" ]; then
+                if grep -q "VARIANTS=''" "$app_filename"; then
+                    continue
+                fi
+                if grep -q 'VARIANTS=""' "$app_filename"; then
+                    continue
+                fi
                 # get the icon for the app
                 icon_filename="/usr/share/${PROJECT_NAME}/android-app/${app_name}.png"
                 if [ -f "$icon_filename" ]; then