v3不能增加子域名
添加域名后页面变全白，但是再点域名列表还可以看到域名已经增加了进入刚添加的域名，增加子域名，设置好内容，点完确定后页面就变全白，再查看子域名列表是空白，然后看log有报错
2017/12/25 17:30:58 [C] the request url is /dns/records
2017/12/25 17:30:58 [C] Handler crashed with error runtime error: index out of range
2017/12/25 17:30:58 [C] /root/go/src/runtime/asm_amd64.s:509
2017/12/25 17:30:58 [C] /root/go/src/runtime/panic.go:491
2017/12/25 17:30:58 [C] /root/go/src/runtime/panic.go:28
2017/12/25 17:30:58 [C] /smb/code/src/wddns/src/controllers/dns.go:261
2017/12/25 17:30:58 [C] /root/go/src/runtime/asm_amd64.s:509
2017/12/25 17:30:58 [C] /root/go/src/reflect/value.go:434
2017/12/25 17:30:58 [C] /root/go/src/reflect/value.go:302
2017/12/25 17:30:58 [C] /smb/code/src/github.com/astaxie/beego/router.go:815
2017/12/25 17:30:58 [C] /root/go/src/net/http/server.go:2619
2017/12/25 17:30:58 [C] /root/go/src/net/http/server.go:1801
2017/12/25 17:30:58 [C] /root/go/src/runtime/asm_amd64.s:2337
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