Fix Assignee selector when 'Unassigned' #2831

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 v 8.3.0 (unreleased)
+  - Fix: Assignee selector is empty when 'Unassigned' is selected (Jose Corcuera)
 v 8.2.0
   - Improved performance of finding projects and groups in various places

app/assets/javascripts/users_select.js.coffee

@@ -58,11 +58,8 @@ class @UsersSelect
             query.callback(data)
-        initSelection: (element, callback) =>
-          id = $(element).val()
-          if id != "" && id != "0"
-            @user(id, callback)
-
+        initSelection: (args...) =>
+          @initSelection(args...)
         formatResult: (args...) =>
           @formatResult(args...)
         formatSelection: (args...) =>
@@ -71,6 +68,14 @@ class @UsersSelect
         escapeMarkup: (m) -> # we do not want to escape markup since we are displaying html in results
           m
+  initSelection: (element, callback) ->
+    id = $(element).val()
+    if id == "0"
+      nullUser = { name: 'Unassigned' }
+      callback(nullUser)
+    else if id != ""
+      @user(id, callback)
+
   formatResult: (user) ->
     if user.avatar_url
       avatar = user.avatar_url