Improve error message if codec for message is missing
Currently, the following warning is displayed if there is no codec. But this message does not indicate that a codec is possibly missing:
13:46:09.915 [Drasyl-Light-Task-ThreadPool-0] WARN org.drasyl.pipeline.HeadContext - Message `city.sane.skipnet.message.NumericIdRoutingWrapper@1f129467` has arrived the end of the pipeline and was not consumed before. Message was dropped.