Crash (assertion failure) deleting rest

Ubuntu 14.04, GIT commit: 37e2b5e

Trying out the new facility to delete a rest to shorten a measure, it crashes with an assertion failure in cmdTimeDelete - it's expecting the selection to be a note. Non-debug versions crash elsewhere presumably because it is trying to treat a rest as a note.

To reproduce:

1) My First Score
2) first measure note input: C (quarter note), esc
3) select the quarter rest
4) ctrl+delete

Result: crash / assertion failure