Merge pull request #576 from Floppy/fix-tag-deletion

Fix removal of tags when setting preview file for a model

Author: Floppy

app/controllers/models_controller.rb

@@ -23,10 +23,10 @@ def update_tags(tags)
 
   def update
     hash = model_params
-    tags = hash.delete(:tags) { |t| "" }
+    tags = hash.delete(:tags)
 
     if @model.update(hash)
-      update_tags(tags.split(","))
+      update_tags(tags.split(",")) if tags
     end
 
     redirect_to [@library, @model]