When suspending and resuming the app, somehow the loader returns
immediately after onResume() with onLoadFinished() but somehow has no
data left (data.moveToNext() returns false) which makes the conversation
close immediately.
Restarting the loader has the desired result: We can leave the app
temporarily and come back to the same conversation again
This also fixes adding a vcard attachment (since that temporarily
leaves the app)
Change-Id: Id52e55563a11474fa776323477aa900ca4be0bbe