How can we automatically delete partial transfers?

[ceremcem]

When a synchronization is interrupted, following error is thrown upon next run:

...
/mnt/erik/snapshots/rootfs/rootfs.20170526T0150 (1.268 GiB)
  ERROR: {u'traceback': u'  File "build/bdist.linux-x86_64/egg/buttersink/ButterStore.py", line 179, in receive', u'errorType': u'Exception', u'command': u'receive', u'server': True, u'error': u"Path /mnt/aea3/snapshots/rootfs/rootfs.20170526T1708 exists, can't receive b118c47c-3128-fc40-8999-1da4c89c4dec"}.

How can I tell buttersink to remove the problematic transfer automatically (maybe delete or mark as "to be deleted")?

[AmesCornish]

I consider this a bug: Buttersink should catch the interruption and rename the subvolume with '.part' at the end. A user script could delete all the '.part' subvolumes, after any troubleshooting.