crmMosaicoBlockMailing - Fix requirement for "Mailing Name"
crmMosaicoBlockMailing - Fix requirement for "Mailing Name"

You must give a "Mailing Name" before submitting a mailing -- and, in
particular, when using the wizard flow, you need to enter a "Mailing Name"
to get through the first step.

veda-consulting/uk.co.vedaconsulting.mosaico,veda-consulting/uk.co.vedaconsulting.mosaico,veda-consulting/uk.co.vedaconsulting.mosaico,veda-consulting/uk.co.vedaconsulting.mosaico