Unable to close wizard after an error is shown

If an error is raised while a wizard is in progress it's not possible to close the wizard as clicking the buttons on the wizard does nothing.

Found on latest trunk.

assigned to @pokoli

added tryton type::crash + 1 deleted label

added 1 deleted label and removed 1 deleted label

assigned to @ced and unassigned @pokoli

review42811003 updated at https://codereview.tryton.org/42811003/#ps1

New changeset 08733d69b5e9 by Cédric Krier in branch 'default':
Process exception during the callback
http://hg.tryton.org/tryton/rev/08733d69b5e9

added 1 deleted label and removed 1 deleted label

closed

New changeset c45ca31530d9 by Cédric Krier in branch '4.6':
Process exception during the callback
http://hg.tryton.org/tryton/rev/c45ca31530d9

mentioned in issue #7094 (closed)