Fix early error handling

tests/py/test_error_page.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+from gratipay.testing.harness import Harness
+
+
+
+
+class Tests(Harness):
+
+    def test_error_page_doesnt_choke_on_no_user(self):
+        try:
+            def fail():
+                raise Exception
+            self.client.website.algorithm.insert_after('parse_environ_into_request', fail)
+            response = self.client.GET('/', raise_immediately=False)
+            import pdb; pdb.set_trace()
+        finally:
+            self.client.website.algorithm.remove('fail')