[#2558] prevent total crash and burn on new dataset save

ckan/templates/package/snippets/package_basic_fields.html

@@ -6,7 +6,7 @@
 
 {{ form.markdown('notes', id='field-notes', label=_('Description'), placeholder=_('eg. Some useful notes about the data'), value=data.notes, error=errors.notes) }}
 
-{{ form.input('tags', id='field-tags', label=_('Tags'), placeholder=_('eg. economy, spending, government'), value=data.tags, error=errors.tags, classes=['control-full']) }}
+{{ form.input('tag_string', id='field-tags', label=_('Tags'), placeholder=_('eg. economy, spending, government'), value=data.tag_string, error=errors.tags, classes=['control-full']) }}
 
 <div class="control-group">
   {% set error = errors.license_id %}