fdo#83798: sw: fix generation of ToX with chapter numbers

(regression from 0a1b1511faaa3302429d93ccdad3eb41dc8f36cb
 and 26259e0cca3bc4d8f45337b0cafea2eed8eb32f9)

Change-Id: Idf9a6f5620c9efe62d2824df1688b30d13a4782e
(cherry picked from commit 9ba1f8e19efd208cb791bc3c51731d9287074b54)
diff --git a/sw/source/core/tox/ToxTextGenerator.cxx b/sw/source/core/tox/ToxTextGenerator.cxx
index 89a45c9..7b43312 100644
--- a/sw/source/core/tox/ToxTextGenerator.cxx
+++ b/sw/source/core/tox/ToxTextGenerator.cxx
@@ -52,7 +52,7 @@ bool sortTabHasNoToxSourcesOrFirstToxSourceHasNoNode(const SwTOXSortTabBase& sor
    if (sortTab.aTOXSources.empty()) {
        return true;
    }
    if (sortTab.aTOXSources.at(0).pNd != NULL) {
    if (sortTab.aTOXSources.at(0).pNd == nullptr) {
        return true;
    }
    return false;
@@ -70,7 +70,7 @@ ToxTextGenerator::GetNumStringOfFirstNode( const SwTOXSortTabBase& rBase, bool b
    }

    OUString sRet;
    if (!rBase.pTxtMark) { // only if it's not a Mark
    if (rBase.pTxtMark) { // only if it's not a Mark
        return sRet;
    }