Project must have namespace for Project#find_with_namespace

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/models/project.rb

@@ -177,15 +177,13 @@ class Project < ActiveRecord::Base
     end
 
     def find_with_namespace(id)
-      if id.include?("/")
+      return nil unless id.include?("/")
+
       id = id.split("/")
       namespace = Namespace.find_by(path: id.first)
       return nil unless namespace
 
       where(namespace_id: namespace.id).find_by(path: id.second)
-      else
-        where(path: id, namespace_id: nil).last
-      end
     end
 
     def visibility_levels