tmf: log error before displaying message

tmf: log error before displaying message

Otherwise the error is logged only after the dialog is closed.
This is not a problem for normal use but for automated tests it can be
tricky since we can stop the test before closing the dialog and still look for
errors.

Change-Id: I1579fa166af2fbe5cd55fdb82b92d976171deaf6
Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Reviewed-on: https://git.eclipse.org/r/61066
Reviewed-by: Hudson CI
Reviewed-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Tested-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>