Update powerwall.sh

powerwall.sh

@@ -223,6 +223,7 @@ CHECKTEMP_SERVICE(){
 		for SENSORa in ${PW_SENSOR_ORD[@]}; do
 			logtemp=${PW_LOGFOLDER}/log-temp-${SENSORa}
 			[ ! -f ${logtemp} ] && touch ${logtemp}
+			[ ! "${last_temp[${SENSORa}]}"] && last_temp[${SENSORa}]=0
 			[ $(expr `date +%s` - $(stat -c %Y ${logtemp})) -ge 3600 ] && relog=1 || relog=0
 						
 			if ([ "${PW_REMOTE_SENSORS[${SENSORa}]}" != "" ] && [ "$(CHECK_HOST ${PW_REMOTE_SENSORS[${SENSORa}]})" != "false" ]) || ([ "${PW_HOST_ADDRESSES[${SENSORa}]}" != "" ] && [ "$(CHECK_HOST ${PW_HOST_ADDRESSES[${SENSORa}]})" != "false" ]); then