RequestException is a base class, log the instance

src/cmsplugin_blurp/renderers/data_source.py

@@ -209,11 +209,11 @@ class Data(object):
                         self.final_url,
                         self.slug)
             log.warning(error)
-        except RequestException:
+        except RequestException, e:
             error = 'HTTP Request failed when loading URL ' \
-                    '%s for renderer %r' % (
+                    '%s for renderer %r: %s' % (
                         self.final_url,
-                        self.slug)
+                        self.slug, e)
             log.warning(error)
         return None, error