Expert Configuration: Allow modifying nil values

The Expert Configuration's approach of classifying configuration properties
based on their dynamic css::uno::Any types is hopelessly naive and broken, but
lets add a little hack to at least allow setting a non-nil value for a nillable
property of non-any type that was nil.

(This change was motivated by the comment at
<https://gerrit.libreoffice.org/c/core/+/132495/1..2/officecfg/registry/schema/org/openoffice/Office/Common.xcs#b2394>
"allow to override the generator/producer string in output documents":  "The
default value is needed because otherwise the advanced settings editor in
Tools->Configure->Advanced claims the type is 'void' and doesn't allow editing
it."

Change-Id: Ia8eef454919b05bda23e56639e93c765ba3a8b13
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/132575
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

0 files changed, 0 insertions, 0 deletions