Resolves: tdf#125808 empty labels in pivot table from registered data source

since...

commit 238cadd315901cbacfd9304bb1205e9f53f13eae
Date:   Wed Apr 10 04:30:25 2019 +0530

    dpcache : use case-insensitive normalization of...

Change-Id: I19057bde268ec07561da323bc694536dcad03a95
Reviewed-on: https://gerrit.libreoffice.org/73806
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/sc/source/core/data/dpcache.cxx b/sc/source/core/data/dpcache.cxx
index 6222ab6..3f096f3 100644
--- a/sc/source/core/data/dpcache.cxx
+++ b/sc/source/core/data/dpcache.cxx
@@ -367,8 +367,8 @@

std::vector<OUString> normalizeLabels(const ScDPCache::DBConnector& rDB, const sal_Int32 nLabelCount)
{
    std::vector<OUString> aLabels(nLabelCount+1);
    aLabels.push_back(ScResId(STR_PIVOT_DATA));
    std::vector<OUString> aLabels(1u, ScResId(STR_PIVOT_DATA));
    aLabels.reserve(nLabelCount + 1);

    LabelSet aExistingNames;