ENYO-3425: avoid error when hasNode return null or false

Related JIRA: https://enyojs.atlassian.net/browse/ENYO-3425

If a control has no related node, getBoundingClientRect cannot be returned. This case must be discarded

Enyo-DCO-1.1-Signed-off-by: Vincent HERILIER vincent.herilier@hp.com