[INTERNAL] sap.m.NavContainer - private method _safeBackToPage added
[INTERNAL] sap.m.NavContainer - private method _safeBackToPage added

Change-Id: I89c4070e83bf639b9be78954bf7458211580d2b1

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