Link to conflicting MR in reopening error message

Also, the error message became shorter.

1 files changed, 1 insertions, 1 deletions

diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index b50cfa639e0..975dea08cee 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -547,7 +547,7 @@ class MergeRequest < ActiveRecord::Base
       similar_mrs = similar_mrs.where('id not in (?)', self.id) if self.id
       if similar_mrs.any?
         errors.add :validate_branches,
-                   "Cannot open this Merge Request because another open Merge Request already exists for this source branch: #{similar_mrs.first.title}"
+                   "Another open Merge Request already exists for this source branch: !#{similar_mrs.first.id}"
       end
     end
   end