[INTERNAL] XMLView: Make handling of SyncPromise result safer
[INTERNAL] XMLView: Make handling of SyncPromise result safer

Change-Id: I50d06c96c953b2b7d77136903a25054a8ad2c3f0

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