Merge "AccountValidator: Handle missing user branches"

java/com/google/gerrit/server/account/AccountConfig.java

@@ -97,9 +97,11 @@ public class AccountConfig extends VersionedMetaData implements ValidationError.
   /**
    * Get the loaded account.
    *
-   * @return loaded account.
+   * @return the loaded account, {@code null} if load didn't find the account because it doesn't
+   *     exist
    * @throws IllegalStateException if the account was not loaded yet
    */
+  @Nullable
   public Account getAccount() {
     checkLoaded();
     return account;