Resolves: fdo#67263 CRASH when deleting applied bulleted paragraph style

Change-Id: I70dc18363480e6c07577a93279ddd083631f6cc3
Reviewed-on: https://gerrit.libreoffice.org/6702Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sw/source/core/text/itrcrsr.cxx

@@ -141,7 +141,7 @@ namespace {
     {
         bool bRet( false );
 
-        if ( rTxtNode.AreListLevelIndentsApplicable() )
+        if ( rTxtNode.GetNumRule() && rTxtNode.AreListLevelIndentsApplicable() )
         {
             int nListLevel = rTxtNode.GetActualListLevel();