[INTERNAL] sap.uxap.ObjectPageLayout - early DOM access bug fixed
[INTERNAL] sap.uxap.ObjectPageLayout - early DOM access bug fixed

The problem, addressed by this patch, is that SectionBase.prototype.setVisible
can be called before the object page is loaded in DOM, but it tries to access DOM.

Change-Id: I3c8f5ead89826329c90de74db72ccd3458c21217

olirogers/openui5,SQCLabs/openui5,olirogers/openui5,nzamani/openui5,SQCLabs/openui5,SAP/openui5,SAP/openui5,cschuff/openui5,cschuff/openui5,nzamani/openui5,SAP/openui5,SQCLabs/openui5,SAP/openui5,nzamani/openui5,olirogers/openui5,cschuff/openui5