Adding an activity to the store returns success even if there is an existing activity with same identifier

[baxtercr]

Add an activity with the same identifier as an existing activity in the store returns true in the success of the completion event, however there is an error.

if success means the method completed ok, then the sample app should be changed to look at the error field, not just the success field.

if success means the activity was added ok, then its returning the wrong value. it should be false.

[baxtercr]

I see this is duplicate