cubicweb-trackervcs #2924056 TaskAddedView.subject crashes [validation pending]

Looks like an incompatibility with vcreview 1.x

Traceback (most recent call last):
File "/usr/lib/python2.6/dist-packages/cubicweb/mail.py", line 212, in render_emails
subject = self.subject()
File "/usr/share/cubicweb/cubes/trackervcs/sobjects.py", line 26, in subject
patch = patch.parent.patch
AttributeError: 'Revision' object has no attribute 'patch'

priorityimportant
typebug
done in1.0.4
load0.500
load left0.000
closed by#a152b770405d Fix task notifications (closes #2924056)
patchFix task notifications (closes #2924056) [applied]