added a slug field to reference template asset using this field

removed print statement

removed unnecessary status code assertion

common/djangoapps/pipeline_mako/templates/static_content.html

@@ -5,6 +5,7 @@ from django.utils.translation import get_language_bidi
 from mako.exceptions import TemplateLookupException
 
 from microsite_configuration import microsite
+from certificates.api import get_asset_url_by_slug
 %>
 
 <%def name='url(file, raw=False)'><%
@@ -14,6 +15,13 @@ except:
     url = file
 %>${url}${"?raw" if raw else ""}</%def>
 
+<%def name='certificate_asset_url(slug)'><%
+try:
+    url = get_asset_url_by_slug(slug)
+except:
+    url = ''
+%>${url}</%def>
+
 <%def name='css(group, raw=False)'>
   <%
       rtl_group = '{}-rtl'.format(group)