Fix for bug #1092, COMException is thrown if powerpoint is open with new presentation or presentation different from one being imported
Fix for bug #1092, COMException is thrown if powerpoint is open with new presentation or presentation different from one being imported


Former-commit-id: cd684a685e1e2b8cdd8bb13e7fe9c0f479218f9d
StackableRegiments/metl2011,StackableRegiments/metl2011,StackableRegiments/metl2011,StackableRegiments/metl2011,StackableRegiments/metl2011,StackableRegiments/metl2011,StackableRegiments/metl2011,StackableRegiments/metl2011,StackableRegiments/metl2011,StackableRegiments/metl2011