Backport EE changes to UserExtractor to CE

This backports the changes EE made to Gitlab::UserExtractor, removing
the need for an EE specific module.

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/gitlab/user_extractor.rb b/lib/gitlab/user_extractor.rb
index 874599688bb..f0557f6ad68 100644
--- a/lib/gitlab/user_extractor.rb
+++ b/lib/gitlab/user_extractor.rb
@@ -11,11 +11,14 @@ module Gitlab
     USERNAME_REGEXP = User.reference_pattern
 
     def initialize(text)
-      @text = text
+      # EE passes an Array to `text` in a few places, so we want to support both
+      # here.
+      @text = Array(text).join(' ')
     end
 
     def users
       return User.none unless @text.present?
+      return User.none if references.empty?
 
       @users ||= User.from_union(union_relations)
     end