cubicweb #1931533 [table view] None in headers list could be replaced by label as computed by default [validation pending]

prioritynormal
typeenhancement
done in3.14.0
load0.100
load left0.000
closed by#67f9677c1253 [table view] allow to set None in 'headers', meaning the label should be fetched from the result set as done by default (closes #1931533)