Check if project.repository before check

Fix for #2776

lib/tasks/gitlab/check.rake

@@ -778,6 +778,7 @@ namespace :gitlab do
       }
 
       Project.find_each(batch_size: 100) do |project|
+        if project.repository
           print "#{project.name_with_namespace.yellow} ... "
 
           correct_options = options.map do |name, value|
@@ -798,6 +799,7 @@ namespace :gitlab do
           end
         end
       end
+    end
 
     def check_repos_post_receive_hooks_is_link
       print "post-receive hooks in repos are links: ... "
@@ -819,6 +821,7 @@ namespace :gitlab do
       puts ""
 
       Project.find_each(batch_size: 100) do |project|
+        if project.repository
           print "#{project.name_with_namespace.yellow} ... "
           project_hook_file = File.join(project.repository.path_to_repo, "hooks", hook_file)
 
@@ -849,6 +852,7 @@ namespace :gitlab do
           end
         end
       end
+    end
 
 
     # Helper methods