Ready bit not set when taglist contains invalid values or other startup problems occur

When the firmware encounters problems upon startup, a special error handling main loop is entered. In that context, the channel does not set the ready bit and as a consequence, the global ready bit is not set and the DPM can not be accessed anymore.

It is expected that in such case at the System Channel is working and that the PNS AP task at least tries to register with DPM to show an error code.