fix ClosetHanger.set_quantity to not call destroy on a new hanger; it confuses flex

app/models/closet_hanger.rb

@@ -69,6 +69,10 @@ class ClosetHanger < ActiveRecord::Base
     end
     
     hanger = self.where(conditions).first
+    
+    if quantity > 0
+      # If quantity is non-zero, create/update the corresponding hanger.
+      
       unless hanger
         hanger = self.new
         hanger.user_id = conditions[:user_id]
@@ -79,13 +83,14 @@ class ClosetHanger < ActiveRecord::Base
         hanger.list_id = conditions[:list_id]
       end
       
-    unless quantity == 0
-      Rails.logger.debug("Logging to #{hanger.id} quantity #{quantity}")
       hanger.quantity = quantity
       hanger.save!
-    else
+    elsif hanger
-      hanger.destroy if hanger
+      # If quantity is zero and there's a hanger, destroy it.
+      hanger.destroy
     end
+    
+    # If quantity is zero and there's no hanger, good. Do nothing.
   end
 
   protected