lib: Ensure notmuch_query_search_messages returns NULL on an exception.

Previously, this function may have segfaulted immediately after
reporting the exception.

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/notmuch.h b/lib/notmuch.h
index 54616336..505ad19f 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -439,6 +439,8 @@ notmuch_query_search_threads (notmuch_query_t *query);
  * notmuch_messages_t object. (For consistency, we do provide a
  * notmuch_messages_destroy function, but there's no good
  * reason to call it if the query is about to be destroyed).
+ *
+ * If a Xapian exception occurs this function will return NULL.
  */
 notmuch_messages_t *
 notmuch_query_search_messages (notmuch_query_t *query);