Handle Route#name being nil after an update

It was possible for the `routes.name` field to be `NULL`, causing
`name_was` to be `nil` after a rename, resulting a bad first argument to
`sub` when attempting to rename descendants. This change adds a
condition to make sure `name_was` is present before attempting the
descendant update.

1 files changed, 1 insertions, 1 deletions

diff --git a/app/models/route.rb b/app/models/route.rb
index 73574a6206b..41e6eb7cb73 100644
--- a/app/models/route.rb
+++ b/app/models/route.rb
@@ -21,7 +21,7 @@ class Route < ActiveRecord::Base
           attributes[:path] = route.path.sub(path_was, path)
         end
 
-        if name_changed? && route.name.present?
+        if name_changed? && name_was.present? && route.name.present?
           attributes[:name] = route.name.sub(name_was, name)
         end