Resolves tdf#112101 crash on particular file with office:event-listeners

Change-Id: I99a007543f90f4024666d296e9a775f8cee15086
Reviewed-on: https://gerrit.libreoffice.org/41723
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

xmloff/source/text/txtparai.cxx

@@ -427,7 +427,7 @@ XMLImpHyperlinkContext_Impl::XMLImpHyperlinkContext_Impl(
 
 XMLImpHyperlinkContext_Impl::~XMLImpHyperlinkContext_Impl()
 {
-    if( mpHint != nullptr )
+    if (mpHint)
         mpHint->SetEnd( GetImport().GetTextImport()
                             ->GetCursorAsRange()->getStart() );
 }
@@ -441,6 +441,7 @@ SvXMLImportContext *XMLImpHyperlinkContext_Impl::CreateChildContext(
     {
         XMLEventsImportContext* pCtxt = new XMLEventsImportContext(
             GetImport(), nPrefix, rLocalName);
+        if (mpHint)
             mpHint->SetEventsContext(pCtxt);
         return pCtxt;
     }