Don't let the last translation act as a default

Change-Id: Ia75743ad23ce651c9aab392098686d1978b49fe2
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/193629
Reviewed-by: Tor Lillqvist <tml@iki.fi>
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/195194
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolan.mcnamara@collabora.com>

xmloff/source/core/xmlimp.cxx

@@ -545,7 +545,9 @@ namespace {
                                     break;
                             }
                         }
-                        if (aKeyString.isEmpty())
+                        if (aLocale.isEmpty())
+                            ; // Do nothing, we don't have a matching translation
+                        else if (aKeyString.isEmpty())
                             aKeyString = aStr;
                         else
                         {