Fix endpoint not setting needed @ci_commit

app/controllers/projects/merge_requests_controller.rb

@@ -7,7 +7,7 @@ class Projects::MergeRequestsController < Projects::ApplicationController
   before_action :closes_issues, only: [:edit, :update, :show, :diffs, :commits, :builds]
   before_action :validates_merge_request, only: [:show, :diffs, :commits, :builds]
   before_action :define_show_vars, only: [:show, :diffs, :commits, :builds]
-  before_action :define_widget_vars, only: [:merge, :cancel_merge_when_build_succeeds]
+  before_action :define_widget_vars, only: [:merge, :cancel_merge_when_build_succeeds, :merge_check]
   before_action :ensure_ref_fetched, only: [:show, :diffs, :commits, :builds]
 
   # Allow read any merge_request
@@ -156,11 +156,7 @@ class Projects::MergeRequestsController < Projects::ApplicationController
   end
 
   def merge_check
-    if @merge_request.unchecked?
-      @merge_request.check_if_can_be_merged
-    end
-
-    closes_issues
+    @merge_request.check_if_can_be_merged if @merge_request.unchecked?
 
     render partial: "projects/merge_requests/widget/show.html.haml", layout: false
   end
@@ -302,6 +298,7 @@ class Projects::MergeRequestsController < Projects::ApplicationController
 
   def define_widget_vars
     @ci_commit = @merge_request.ci_commit
+    closes_issues
   end
 
   def invalid_mr