Allow providing an empty title to InteractiveAuthDialog

Author: andybalaam

src/components/views/dialogs/InteractiveAuthDialog.tsx

@@ -136,7 +136,7 @@ export default class InteractiveAuthDialog<T> extends React.Component<Interactiv
         // Let's pick a title, body, and other params text that we'll show to the user. The order
         // is most specific first, so stagePhase > our props > defaults.
 
-        let title = this.state.authError ? "Error" : this.props.title || _t("common|authentication");
+        let title = this.state.authError ? "Error" : (this.props.title ?? _t("common|authentication"));
         let body = this.state.authError ? null : this.props.body;
         let continueText: string | undefined;
         let continueKind: ContinueKind | undefined;