Prevent newline (#14)

to make sure the output is strictly empty when voltage is not available.

Author: kretep

scripts/getvoltage.sh

@@ -3,5 +3,5 @@
 command -v socat >/dev/null 2>&1 || { echo >&2 "I require socat but it's not installed. Aborting."; exit 1; }
 
 RESPONSE=`echo '{"command":"read_voltage"}' | socat -,ignoreeof ~/src/openaps-menu/socket-server.sock | sed -n 's/.*"response":\([^}]*\)}/\1/p'`
-echo $RESPONSE
+[[ $RESPONSE = *[![:space:]]* ]] && echo $RESPONSE
 #./getvoltage.sh | sed -n 's/.*"response":\([^}]*\)}/\1/p'