HPCC-8645 Configmgr - Add attribute in XML view fails in IE

Signed-off-by: Gleb Aronsky <gleb.aronsky@lexisnexis.com>
Merge pull request #3894 from garonsky/issue-8645_add_attribute_fails_in_ie_310

HPCC-8645 Configmgr - Add attribute in XML view fails in IE

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>