Musescore SIGABRTs when opening a score with a slur ending on a rest

To reproduce: using Musescore 1.3, make a slur from a note to a rest. Open the saved score with git head (as of 15f899f). Musescore will give an xml read error and SIGABRT.
Expected result: musescore renders slur as specified.
Accepted result: musescore ignores the slur in question.

A reason for having a slur to a rest in scores could be to try and fudge a jazz doit or similar, as these symbols are not present in Musescore 1.3.

Problem score attached. Apologies it's not a small test case, but I managed to wreck my 1.3 installation when I installed the latest head.