Fix cookie empty issue · Pull Request !38 · openEuler/ci-bot

Fix the panic issue when cookie is empty
```
I0408 12:39:54.987796       1 clahandler.go:83] Get cookie err: http: named cookie not present\n
I0408 12:39:54.987805       1 clahandler.go:86] cla request content: {0 0xc0002f44e0 <nil> <nil> 0xc0002f44f0 0xc0002f4510 0xc0002f4520 0xc0002f4540 0xc0002f4550}\n
2020/04/08 12:39:54 http: panic serving 172.16.1.33:56296: runtime error: invalid memory address or nil pointer dereference\n
goroutine 8939643 [running]:\n
net/http.(*conn).serve.func1(0xc0008815e0)\n
	/usr/local/go/src/net/http/server.go:1769 +0x139\n
panic(0x9db500, 0xf2f6e0)\n
	/usr/local/go/src/runtime/panic.go:522 +0x1b5\n
gitee.com/openeuler/ci-bot/pkg/cibot.(*CLAHandler).ServeHTTP(0xc0001e7290, 0xb72f20, 0xc000878540, 0xc00083dd00)\n
	/go/src/gitee.com/openeuler/ci-bot/pkg/cibot/clahandler.go:87 +0xb5a\n
net/http.HandlerFunc.ServeHTTP(0xc0001e72a0, 0xb72f20, 0xc000878540, 0xc00083dd00)\n
	/usr/local/go/src/net/http/server.go:1995 +0x44\n
net/http.(*ServeMux).ServeHTTP(0xf3da40, 0xb72f20, 0xc000878540, 0xc00083dd00)\n
	/usr/local/go/src/net/http/server.go:2375 +0x1d6\n
net/http.serverHandler.ServeHTTP(0xc0000cdee0, 0xb72f20, 0xc000878540, 0xc00083dd00)\n
	/usr/local/go/src/net/http/server.go:2774 +0xa8\n
net/http.(*conn).serve(0xc0008815e0, 0xb73d20, 0xc0007a2d80)\n
	/usr/local/go/src/net/http/server.go:1878 +0x851\n
created by net/http.(*Server).Serve\n
```

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