[#1011] base.py: Explicitly re-raise TemplateNotFound

Functions should not implicitly raise exceptions by failing to catch
exceptions raised by functions that they call, they should explicitly
catch and re-raise the exceptions instead.

ckan/lib/base.py

@@ -104,7 +104,10 @@ def render_template():
         # we remove it so any bad templates crash and burn
         del globs['url']
 
-        template_path, template_type = render_.template_info(template_name)
+        try:
+            template_path, template_type = render_.template_info(template_name)
+        except render_.TemplateNotFound:
+            raise
 
         # snippets should not pass the context
         # but allow for legacy genshi templates
@@ -202,6 +205,8 @@ def render_template():
         raise ckan.exceptions.CkanUrlException(
             '\nAn Exception has been raised for template %s\n%s' %
             (template_name, e.message))
+    except render_.TemplateNotFound:
+        raise
 
 
 class ValidationException(Exception):