fix(ui): renders versions tab count only when docs exist

packages/ui/src/elements/DocumentHeader/Tabs/tabs/VersionsPill/index.tsx

@@ -6,5 +6,10 @@ import { baseClass } from '../../Tab/index.js'
 
 export const VersionsPill: React.FC = () => {
   const { versions } = useDocumentInfo()
+
+  if (versions?.totalDocs > 0) {
     return <span className={`${baseClass}__count`}>{versions?.totalDocs?.toString()}</span>
   }
+
+  return null
+}