Allow to attach to multithreaded processes
Allow to attach to multithreaded processes

Especially in multi threaded processes it happens often that no thread is
selected. In this case you will get the following prompt:
>
But in jdb.ts, a prompt like this is expected:
main[1]

This fix, checks also for '> ', which makes it possible to attach to
multithreaded processes.

DonJayamanne/javaVSCode,dueckminor/javaVSCode