fix(Attachment): do not render progress value

CHANGELOG.md

@@ -24,6 +24,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Fix build on Windows @jurokapsiar ([#383](https://github.com/stardust-ui/react/pull/383))
 - Add warning for rendering components outside provider @Bugaa92 ([#378](https://github.com/stardust-ui/react/pull/378))
 - Fix icon colors for Teams theme @codepretty ([#384](https://github.com/stardust-ui/react/pull/384))
+- Do not render the Attachment's `progress` value to the DOM @levithomason ([#402](https://github.com/stardust-ui/react/pull/402))
 
 ### Features
 - Export `mergeThemes` @levithomason ([#285](https://github.com/stardust-ui/react/pull/285))

src/components/Attachment/Attachment.tsx

@@ -162,7 +162,7 @@ class Attachment extends UIComponent<Extendable<AttachmentProps>, any> {
           </div>
         )}
         {!_.isNil(progress) &&
-          createHTMLDivision(progress, {
+          createHTMLDivision('', {
             defaultProps: { className: classes.progress },
             render: renderProgress,
           })}