First make sure that a battery is present.

Signed-off-by: Jacob Kiers <jacob@jacobkiers.net>

bin/battery

@@ -42,6 +42,10 @@ battery_status()
 case $(uname -s) in
     "Linux")
         BATPATH=${BATPATH:-/sys/class/power_supply/BAT0}
+        if [ ! -d $BATPATH ]; then
+            exit 0
+        fi
+
         STATUS=$BATPATH/status
         [ "$1" = `cat $STATUS` ] || [ "$1" = "" ] || return 0
         if [ -f "$BATPATH/energy_full" ]; then