Mr-Redis UI single instance create successfully when name is null

[zousheng]

When I tried to create a single redis instance and didn't intput any field, just click "CREATE" button, it will create a redis with name as null, the request url is v1/CREATE/null/32/1/0, the instance name field actually is required, but it seems not working as expected. Maybe the front end and backend need to change for this null check?

[zousheng]

Raised a pr for this issue, #64.