handle "parse" errors

[sebseb7]

when the code inside a .on('someevent',handler) handler fails, a "parse" error occurs, which is silently dropped and the connection is closed.

Solution: have a on('parse_error',data,error) event.

code from manager.ts which silently drops the "e" :

  /**
   * Called with data.
   *
   * @private
   */
  private ondata(data): void {
    try {
      this.decoder.add(data);
    } catch (e) {
      this.onclose("parse error");
    }
  }

[m4heshd]

Wasted so much time on this. Couldn't find WTH was going on because the error was silently consumed by socket.io client.

[darrachequesne]

This should be fixed by 2403b88, included in version 4.5.3. Sorry for the mess!