add commitauthor type

Author: lynnagara

src/sentry/static/sentry/app/types/index.tsx

@@ -59,3 +59,8 @@ export type User = {
   username: string;
   email: string;
 };
+
+export type CommitAuthor = {
+  email?: string;
+  name?: string;
+};

src/sentry/static/sentry/app/utils/formatters.tsx

@@ -1,9 +1,9 @@
 import {get} from 'lodash';
 
 import {t} from 'app/locale';
-import {User} from 'app/types';
+import {CommitAuthor, User} from 'app/types';
 
-export function userDisplayName(user: User): string {
+export function userDisplayName(user: User | CommitAuthor): string {
   let displayName = String(get(user, 'name', t('Unknown author'))).trim();
 
   if (displayName.length <= 0) {
@@ -13,7 +13,7 @@ export function userDisplayName(user: User): string {
   const email = String(get(user, 'email', '')).trim();
 
   if (email.length > 0 && email !== displayName) {
-    displayName += ' (' + user.email + ')';
+    displayName += ' (' + email + ')';
   }
   return displayName;
 }