fix(prejoin): Don't overwrite display name with ''

react/features/base/jwt/functions.js

@@ -24,5 +24,5 @@ export function parseJWTFromURLParams(url: URL = window.location) {
 export function getJwtName(state: Object) {
     const { user } = state['features/base/jwt'];
 
-    return user?.name || '';
+    return user?.name;
 }

react/features/base/settings/middleware.js

@@ -135,11 +135,13 @@ function _maybeUpdateDisplayName({ dispatch, getState }) {
     if (hasJwt) {
         const displayName = getJwtName(state);
 
+        if (displayName) {
             dispatch(updateSettings({
                 displayName
             }));
         }
     }
+}
 
 /**
  * Updates the local participant according to settings changes.