Resolve bug in preset handler if the filepath hasn't been set by setup

modules/radioPresetHandler.mjs

@@ -75,6 +75,9 @@ const convertFrequencyToHertz = async (frequency) => {
  * @returns {any} The object containing the different systems the bot is near
  */
 export const getAllPresets = () => {
+    // If the config path hasn't been set by setup
+    if (!configFilePath) return {};
+    
     const presetDir = resolve(configFilePath);
     console.log(`Getting presets from directory: '${presetDir}'`);
     if (existsSync(presetDir)) return JSON.parse(readFileSync(presetDir));