cubicweb-vcreview #2731088 has_review attribute should be required [done]

prioritynormal
typebug
done in1.0.1
load left0.000
closed by#dece2aab2093 [schema] has_review is required (closes #2731088), #0bded4ef1e11 [migration] explicitly set default value for `has_review` (closes #2731088)