wina11y: Just return empty attr string when none present

If the `XAccessibleExtendedAttributes` interface
isn't implemented, just return an empty string
for the attributes instead of an error code.

(This seems like a totally valid case to me,
no need to report an error.)

Change-Id: I986f030bc7a01da0fdd92a5aa2b4cf3c0d6a9200
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/158258
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

0 files changed, 0 insertions, 0 deletions