Make sure services with blank UUIDs don't make it into the registry

[kyleterry]

2014/08/26 18:15:46 Loading configuration from /home/kyle/.config/tenyks/config.json
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x0 pc=0x451d6f]

goroutine 42 [running]:
runtime.panic(0x65e200, 0x7ebdf3)
        /usr/lib/go/src/pkg/runtime/panic.c:279 +0xf5
github.com/kyleterry/tenyks/service.(*Connection).ByeServiceHandler(0xc20804c080, 0xc20828e370)
        /home/kyle/src/tenyks/build/src/github.com/kyleterry/tenyks/service/handlers.go:83 +0x18f
github.com/kyleterry/tenyks/service.func·004(0xc2081f2240, 0x2, 0x2)
        /home/kyle/src/tenyks/build/src/github.com/kyleterry/tenyks/service/handlers.go:16 +0xa2
created by github.com/kyleterry/tenyks/service.(*Connection).ircify
        /home/kyle/src/tenyks/build/src/github.com/kyleterry/tenyks/service/ircify.go:59 +0x3ba

goroutine 16 [chan receive]:
main.main()
        /home/kyle/src/tenyks/tenyks/tenyks.go:117 +0xbc8

goroutine 19 [finalizer wait]:
runtime.park(0x414390, 0x7f0088, 0x7eeb69)
        /usr/lib/go/src/pkg/runtime/proc.c:1369 +0x89
runtime.parkunlock(0x7f0088, 0x7eeb69)
        /usr/lib/go/src/pkg/runtime/proc.c:1385 +0x3b
runfinq()
        /usr/lib/go/src/pkg/runtime/mgc0.c:2644 +0xcf
runtime.goexit()
        /usr/lib/go/src/pkg/runtime/proc.c:1445

goroutine 20 [IO wait]:
net.runtime_pollWait(0x7f8914814708, 0x72, 0x0)
        /usr/lib/go/src/pkg/runtime/netpoll.goc:146 +0x66
net.(*pollDesc).Wait(0xc208028060, 0x72, 0x0, 0x0)
        /usr/lib/go/src/pkg/net/fd_poll_runtime.go:84 +0x46
net.(*pollDesc).WaitRead(0xc208028060, 0x0, 0x0)
        /usr/lib/go/src/pkg/net/fd_poll_runtime.go:89 +0x42
net.(*netFD).Read(0xc208028000, 0xc208059000, 0x1000, 0x1000, 0x0, 0x7f89148132b8, 0xb)
        /usr/lib/go/src/pkg/net/fd_unix.go:232 +0x34c
net.(*conn).Read(0xc208038020, 0xc208059000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
        /usr/lib/go/src/pkg/net/net.go:122 +0xe7
bufio.(*Reader).fill(0xc208004120)
        /usr/lib/go/src/pkg/bufio/bufio.go:97 +0x1b3
bufio.(*Reader).ReadSlice(0xc208004120, 0x7f891465490a, 0x0, 0x0, 0x0, 0x0, 0x0)
        /usr/lib/go/src/pkg/bufio/bufio.go:298 +0x22c
github.com/garyburd/redigo/redis.(*conn).readLine(0xc2080460a0, 0x0, 0x0, 0x0, 0x0, 0x0)
        /home/kyle/src/tenyks/build/src/github.com/garyburd/redigo/redis/conn.go:195 +0x77
github.com/garyburd/redigo/redis.(*conn).readReply(0xc2080460a0, 0x0, 0x0, 0x0, 0x0)
        /home/kyle/src/tenyks/build/src/github.com/garyburd/redigo/redis/conn.go:268 +0x65
github.com/garyburd/redigo/redis.(*conn).Receive(0xc2080460a0, 0x0, 0x0, 0x0, 0x0)
        /home/kyle/src/tenyks/build/src/github.com/garyburd/redigo/redis/conn.go:351 +0x125
github.com/garyburd/redigo/redis.PubSubConn.Receive(0x7f8914814aa8, 0xc2080460a0, 0x0, 0x0)
        /home/kyle/src/tenyks/build/src/github.com/garyburd/redigo/redis/pubsub.go:97 +0x66
github.com/kyleterry/tenyks/service.func·001()