Bug#933499: libreoffice-base: database form with subform no longer works with "Data content could not be loaded" error

[MAG4 Piemonte]

Hi Rene, upgrading some days ago from version 6.1.5-3 with libreoffice-mysql-
connector to 6.3.0~rc2-1 with libreoffice-sdbc-mysql we find the bug in the old 
.odb files (created with libreoffice-mysql-connector and solved using https://
bugs.documentfoundation.org/show_bug.cgi?id=117053#c11). The new .odb files 
(created with libreoffice-sdbc-mysql) are not affected.
Regards!

Guido