fix: error param

Author: DiegoRBaquero

lib/client/udp-tracker.js

@@ -133,8 +133,7 @@ class UDPTracker extends Tracker {
       try {
         // Error.message is readonly on some platforms.
         if (err.message) err.message += ` (${self.announceUrl})`
-      } catch (ignored) {
-      }
+      } catch (ignoredErr) {}
       // errors will often happen if a tracker is offline, so don't treat it as fatal
       self.client.emit('warning', err)
     }