tdf#123050: catch object does not have a key labeled 'theme_data'

json::document_error: node::child: this object does not have a key labeled 'theme_data'

Change-Id: Ic4daf53cff4e3e25b83393cb92957bf60cd5a92c
Reviewed-on: https://gerrit.libreoffice.org/67161
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/cui/source/options/personalization.cxx b/cui/source/options/personalization.cxx
index 3f496be..f5d6e9f 100644
--- a/cui/source/options/personalization.cxx
+++ b/cui/source/options/personalization.cxx
@@ -815,10 +815,10 @@
        return PersonaInfo();
    }

    auto theme_data = aDocumentRoot.child("theme_data");

    try
    {
        auto theme_data = aDocumentRoot.child("theme_data");

        PersonaInfo aNewPersona = {
            OUString(),
            OStringToOUString( OString(theme_data.child("name").string_value().get()),