Merge pull request #1765 from asgerb/where-patch

Only call where if needed

lib/simple_form/form_builder.rb

@@ -497,7 +497,7 @@ module SimpleForm
           conditions = reflection.options[:conditions]
           conditions = object.instance_exec(&conditions) if conditions.respond_to?(:call)
 
-          relation = relation.where(conditions) if relation.respond_to?(:where)
+          relation = relation.where(conditions) if relation.respond_to?(:where) && conditions.present?
           relation = relation.order(order) if relation.respond_to?(:order)
         end