python: more error handling fixes

This is a follow up commit to 221c7e0b38177f5f1dbf0561580c15e8aaa49004
fixing more NULL pointer checks.

Signed-off-by: Justus Winter <4winter@informatik.uni-hamburg.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/bindings/python/notmuch/filename.py b/bindings/python/notmuch/filename.py
index 469b6a5..322e6bf 100644
--- a/bindings/python/notmuch/filename.py
+++ b/bindings/python/notmuch/filename.py
@@ -89,7 +89,7 @@ class Filenames(Python3StringMixIn):
 
         This is the main function that will usually be used by the
         user."""
-        if self._files is None:
+        if not self._files:
             raise NotmuchError(STATUS.NOT_INITIALIZED)
 
         while self._valid(self._files):