lisa.wlgen.rta: Make RTA.run() flow obvious
lisa.wlgen.rta: Make RTA.run() flow obvious

Make it obvious under which condition the log file pulling code is
executed, rather than having an early return.

credp/lisa,ARM-software/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa,credp/lisa