QtIFW

Do not append the output if it is empty.

For some unknown reason it will then append a new line. Use
a more appropriate wording for the timer interval.

Change-Id: Iddfe5a2a3103f31285dba14a251b5c87ab51c3bf
Reviewed-on: http://codereview.qt.nokia.com/3647
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Niels Weber <niels.2.weber@nokia.com>
Reviewed-by: Tim Jenssen <tim.jenssen@nokia.com>