Do not throw an error in case RKA substring was not found

src/utils/rka.ts

@@ -105,7 +105,7 @@ export const findRKASubstring = (
   );
 
   if (startingIndex === -1) {
-    throw new Error("Unable to find RKA substring");
+    return "";
   }
 
   return string.slice(startingIndex, startingIndex + substringSize);