[Bug][Form] Fix W3C markup validation of the empty select option tag

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | 
| License       | MIT
| Doc PR        | 

To spend the HTML5 W3C validation, the Option tag can not have a empty label. it's therefore necessary to add Label attribute.