Update file permissions and enhance error handling in API responses

api/settings/appname.php

@@ -12,7 +12,13 @@ $api = new gbAPI(false, $internal);
 
 // Get App Name
 $result = $api->getSetting("application_name");
-
-$api->answer(200, [
-    "application_name" => $result
-]);
+if ($result !== NULL) {
+    $api->answer(200, [
+        "application_name" => $result
+    ]);
+}else{
+    $api->answer(500, [
+        "error" => "empty_query",
+        "error_text" => "Database query returned nothing."
+    ]);
+}