Debugger: Fail more gracefully on "ill" LLDB engines

Less need to use the hard Debug->Abort

Change-Id: Ib019792063924549ace58a63ccef994dbfaa00dc
Reviewed-by: hjk <hjk121@nokiamail.com>
Debugger: Better fall back for LLDB without remote support

Change-Id: I517052bb795674d4beda05e3909dc05afc99bfe3
Reviewed-by: hjk <hjk121@nokiamail.com>