Stop linking a stylesheet if there are no style overrides

[brionmario]

Is your suggestion related to an experience ? Please describe.

We have linked an empty stylesheet in some components and it is rendering a redundant style block in the browsers.

• Empty Stylesheet: https://github.com/wso2/oxygen-ui/blob/v1.5.0/packages/react/src/components/Select/select.scss#L19

• Import: https://github.com/wso2/oxygen-ui/blob/v1.5.0/packages/react/src/components/Select/Select.tsx#L26

  

Describe the improvement

Remove the empty stylesheets along with their respective imports.