tdf#136704 sw autofmt: prevent crash if no nextNode

The second GetNextNode() was a nullptr
that was being dereferenced.

Now, when enter is pressed after some text followed by a colon,
that line is made into a heading3, and the new blank line is
properly using the text body paragraph style.

Change-Id: If10dc85e490ac57fc150b3d541f5033dfd5293bb
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/109413
Tested-by: Jenkins
Reviewed-by: Justin Luth <justin_luth@sil.org>
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>
(cherry picked from commit fea7b531a4c9e8326a644cccc26325b16585675a)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/109520

0 files changed, 0 insertions, 0 deletions