[#1011] Fix a broken import in the package controller

An exception was not getting caught because of the way this import was
done.

ckan/controllers/package.py

@@ -19,7 +19,7 @@
 import ckan.lib.datapreview as datapreview
 import ckan.lib.plugins
 import ckan.plugins as p
-import lib.render
+import ckan.lib.render
 
 from ckan.common import OrderedDict, _, json, request, c, g, response
 from home import CACHE_PARAMETERS
@@ -366,7 +366,7 @@ def read(self, id, format='html'):
 
         try:
             return render(template, loader_class=loader)
-        except lib.render.TemplateNotFound:
+        except ckan.lib.render.TemplateNotFound:
             msg = _("Viewing {package_type} datasets in {format} format is "
                     "not supported (template file {file} not found).".format(
                     package_type=package_type, format=format, file=template))