Fix: Handle buttons with a type but without any options as an empty button (Reworked). (Issue reported by Dave Burgess)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5647 43c1dc8c-776e-4df2-8ef1-6e829299be21
Debug: Reduce debug level of session without a device attached output.

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5648 43c1dc8c-776e-4df2-8ef1-6e829299be21