Fix default values handler causing widget state reset
Fix default values handler causing widget state reset

If there are no default values for the form, don't try to
set empty default values as it may reset widget states
updated by previous onNew actions.

Fixes RM-6552

axelor/axelor-development-kit,axelor/axelor-development-kit,axelor/axelor-development-kit,axelor/axelor-development-kit