[AH-1778] Don't try to add 'created' mapLayer if it's null.
[AH-1778] Don't try to add 'created' mapLayer if it's null.

uhef/Oskari-Routing-frontend,uhef/Oskari-Routing-frontend,uhef/Oskari-Routing-frontend,uhef/Oskari-Routing-frontend,uhef/Oskari-Routing-frontend,uhef/Oskari-Routing-frontend