fix problem with blank areas throwing a 500

diff --git a/app/models/relation.rb b/app/models/relation.rb
index 74832a7d9f1cca594d098abd98e0e755e9b35c67..0d10b77284358cd4975d8c2b7a76b7b1716c176d 100644 (file)
--- a/app/models/relation.rb
+++ b/app/models/relation.rb
@@ -106,6 +106,7 @@ class Relation < ActiveRecord::Base
     # collect relationships. currently done in one big block at the end;
     # may need to move this upwards if people want automatic completion of
     # relationships, i.e. deliver referenced objects like we do with ways...
+       return [] if node_ids.empty? and node_ids.empty?
     relations = Array.new
     if node_ids.length > 0
         relations += Relation.find_by_sql("select e.* from current_relations e,current_relation_members em where " +