Uninstaller: fixed Uninstaller failing if no overlayed apps from System Mode exist

uninstaller/META-INF/com/google/android/update-binary

@@ -166,27 +166,31 @@ config_locations="/sdcard /external_sd /data $(dirname ${ZIP}))"
 config_files=".nanodroid-setup .nanodroid-apps .nanodroid-overlay"
 
 restore_apps () {
-	for app in /sdcard/nanodroid_backups/app/*; do
-		if [ -d /system/app/${app} ]; then
-			ui_print " << removing backup: app:${app}"
-			rm -rf /sdcard/nanodroid_backups/app/${app}
-		else
-			ui_print " << restoring: app:${app}"
-			mv /sdcard/nanodroid_backups/app/${app} \
-				/system/app/ || error " failed to restore ${app}"
-		fi
-	done
+	if [ -d /sdcard/nanodroid_backups/app/ ]; then
+		for app in /sdcard/nanodroid_backups/app/*; do
+			if [ -d /system/app/${app} ]; then
+				ui_print " << removing backup: app:${app}"
+				rm -rf /sdcard/nanodroid_backups/app/${app}
+			else
+				ui_print " << restoring: app:${app}"
+				mv /sdcard/nanodroid_backups/app/${app} \
+					/system/app/ || error " failed to restore ${app}"
+			fi
+		done
+	else
 
-	for app in /sdcard/nanodroid_backups/priv-app/*; do
-		if [ -d /system/priv-app/${app} ]; then
-			ui_print " << removing backup: priv-app:${app}"
-			rm -rf /sdcard/nanodroid_backups/priv-app/${app}
-		else
-			ui_print " << restoring: priv-app:${app}"
-			mv /sdcard/nanodroid_backups/priv-app/${app} \
-				/system/priv-app/ || error " failed to restore ${app}"
-		fi
-	done
+	if [ -d /sdcard/nanodroid_backups/priv-app/ ]; then
+		for app in /sdcard/nanodroid_backups/priv-app/*; do
+			if [ -d /system/priv-app/${app} ]; then
+				ui_print " << removing backup: priv-app:${app}"
+				rm -rf /sdcard/nanodroid_backups/priv-app/${app}
+			else
+				ui_print " << restoring: priv-app:${app}"
+				mv /sdcard/nanodroid_backups/priv-app/${app} \
+					/system/priv-app/ || error " failed to restore ${app}"
+			fi
+		done
+	fi
 }
 
 system_mode_uninstall () {