cubicweb-vcreview #3007267 crash on revision without description [validation pending]

patch creation does "rev.description.splitlines()[0]" which breaks if the description is empty.

prioritynormal
typebug
done in1.2.0
load left0.000
closed by#d5bc6932edc8 [hooks] deal with revisions lacking a description
patch[hooks] deal with revisions lacking a description [applied]