tools-ma: change the location of the files array verification
tools-ma: change the location of the files array verification

	* Move the 'if not files' verification to the
	_run_checker function in order avoid printing
	an error message when there aren't files to
	check.

Change-Id: I2630770c385dc4db205302b31ab3bc3c25d0d86a
Signed-off-by: Rafael Peria de Sene <406aac9882a9c6513d2651b5351415dcf8d65bcf@br.ibm.com>

open-power-sdk/migration-advisor,open-power-sdk/migration-advisor,open-power-sdk/migration-advisor,open-power-sdk/migration-advisor