tdf#121337: Fail on GIO error in GIO UCP getPropertyValue

Change-Id: I10ffe50be56ed99539f59f043a710863652d2394
diff --git a/ucb/source/ucp/gio/gio_content.cxx b/ucb/source/ucp/gio/gio_content.cxx
index bc840e6..a581c34 100644
--- a/ucb/source/ucp/gio/gio_content.cxx
+++ b/ucb/source/ucp/gio/gio_content.cxx
@@ -544,7 +544,12 @@
                const uno::Sequence< beans::Property >& rProperties,
                const uno::Reference< ucb::XCommandEnvironment >& xEnv )
{
    GFileInfo *pInfo = getGFileInfo(xEnv);
    GError * err = nullptr;
    GFileInfo *pInfo = getGFileInfo(xEnv, &err);
    if (pInfo == nullptr && !mbTransient) {
        ucbhelper::cancelCommandExecution(mapGIOError(err), xEnv);
    }
    assert(err == nullptr);
    return getPropertyValuesFromGFileInfo(pInfo, m_xContext, xEnv, rProperties);
}