cubicweb-trackervcs #2821863 migration to 1.0.0 explodes if vcreview is not present [validation pending]

vcreview is optional, and "sync_schema_props_perms('patch_ticket')" breaks if it's not there.

prioritynormal
typebug
done in1.0.2
load left0.000
closed by#9b7bf523e2cf Fix 1.0.0 migration if vcreview is not installed
patchFix 1.0.0 migration if vcreview is not installed [applied]