Deal with partially setup packages in the redirect hook.

flask/testsuite/ext.py

@@ -8,6 +8,8 @@
     :copyright: (c) 2011 by Armin Ronacher.
     :license: BSD, see LICENSE for more details.
 """
+from __future__ import with_statement
+
 import sys
 import unittest
 from flask.testsuite import FlaskTestCase
@@ -92,6 +94,11 @@ class ExtImportHookTestCase(FlaskTestCase):
         from flask.ext.oldext_package.submodule import test_function
         self.assert_equal(test_function(), 42)
 
+    def test_flaskext_broken_package_no_module_caching(self):
+        for x in xrange(2):
+            with self.assert_raises(ImportError):
+                import flask.ext.broken
+
 
 def suite():
     suite = unittest.TestSuite()