Don't assume either namespace is not-None

jedi/parsing_representation.py

@@ -333,7 +333,7 @@ def _enables_absolute_import(imp):
     Checks if the import is a ``__future__`` import that enables the
     ``absolute_import`` feature.
     """
-    if imp.namespace is None:
+    if imp.from_ns is None or imp.namespace is None:
         return False
 
     namespace, feature = imp.from_ns.names[0], imp.namespace.names[0]

test/test_absolute_import.py

@@ -24,7 +24,7 @@ def test_py2_imports_are_not_always_absolute():
 def test_dont_break_imports_without_namespaces():
     """
     The code checking for ``from __future__ import absolute_import`` shouldn't
-    assume that all imports have non-``None`` ``namespace`` attributes.
+    assume that all imports have non-``None`` namespaces.
     """
     src = "from __future__ import absolute_import\nimport xyzzy"
     parser = Parser(src, "test.py")