[FIX] sap.m.Combobox: Selecting an unexisting item does not throw an error
[FIX] sap.m.Combobox: Selecting an unexisting item does not throw an error

BCP: 1970046790
Change-Id: I267a7699ad4359a5a6b02720282769512a93c3bf

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5