cubicweb #1766202 Migration scripts creation TZDate, TZDatetime and BigInt can fail [resolved]

If the DB was created with a recent version of yams, TZDate, TZDatetime and BigInt will be present in the schema and the migration scripts will crash.

priorityimportant
typebug
done in3.12.7
load0.300
load left0.000
closed by#86e9632a4e9c fix 3.13.0 migration script (closes #1766202), #074a6cec246b fix 3.12.0 migration script (closes: #1766202)