Please review the fix for IZ 186507 (IllegalArgumentException: Invalid line=-1 or column=0)

Hi,

please review the fix for IZ 186507 (IllegalArgumentException: Invalid 
line=-1 or column=0)

Changeset: http://hg.netbeans.org/cnd-main/rev/f98663729e29

If user click on a file but not open it and then add a new breakpoint 
the exception is raised.
The issue is that 
EditorContextDispatcher.getDefault().getMostRecentFile() may be not null but
EditorContextDispatcher.getDefault().getMostRecentLineNumber() may be <0.
The fix is to add extra check for that the same way it is done in 
debugger core.

Fix is reviewed by Vladimir Voskresensky and verified by QA.

Thanks,
Egor