Update powerwall.sh

powerwall.sh

@@ -220,7 +220,7 @@ CHECKTEMP_SERVICE(){
 				else
 					SENSORS_CHECK=(${SENSORa})
 				fi
-				
+				if [ "${SENSORS_CHECK}" != "" ]; then
 					for SENSOR in "${SENSORS_CHECK[@]}"; do
 				
 						if [ "${PW_SENSOR_TYPE[${SENSORa}]}" == "mqtt" ]; then
@@ -373,6 +373,7 @@ Previous Temp: ${last_temp[${SENSOR}]}'F"
 						fi
 				
 					done
+				fi
 			
 			elif [ "${PW_HOST_ADDRESSES[${SENSORa}]}" == "" ]; then #sensor down
 				if [ ! -f ${PW_TMPFOLDER}/${SENSORa}.down ] || [ $(expr `date +%s` - $(stat -c %Y ${PW_TMPFOLDER}/${SENSORa}.down)) -ge 1800 ]; then