Catch init errors

Without the if statement, the pkill might throw an error, which causes
the init script to crash.

Author: isaaclw

mythpywii.conf

@@ -8,7 +8,9 @@ start on (local-filesystems
 stop on stopping dbus
 
 script
-    pkill -f /usr/local/bin/myth_py_wii.py
+    if pgrep -f /usr/local/bin/myth_py_wii.py; then
+        pkill -f /usr/local/bin/myth_py_wii.py
+    fi
     bluetooth_devices=$(lsusb |
         grep "Broadcom Corp. BCM2046B1 USB 2.0 Hub" |
         cut -d ':' -f 1 |