Adapter tries to open a connection on Null forward open

A null forward open which does not match an existing connection should, according to the specification, implement a ping mechanism between scanner and adapter.

A null forward open which matches an existing connection should implement the ping mechanism as well and additionally should allow reconfiguration of the exisiting connection on the fly.

In contrast, the stack currently tries to open a connection if a null forward open is received, disregarding whether it matches or not. This is a bug.