Fix not working automatic removal of old working dir in case of all action.

sit

@@ -245,7 +245,7 @@ sit_countdown 3
 
 # if working dir already exists and execution option is Default then remove
 # previous working directory and create new
-if [[ -d ${WORKDIR} && -z $sit_action ]] ; then
+if [[ -d ${WORKDIR} && $sit_action == "all" ]] ; then
     sit_info "Removing existing working directory ${WORKDIR}"
     sit_countdown 5
     rm -rf ${WORKDIR}