From ec55fa86a0d4acc7f462f106ccce25c9d2704856 Mon Sep 17 00:00:00 2001
From: HansBug <killog@126.com>
Date: Sun, 12 Sep 2021 23:13:04 +0800
Subject: [PATCH] fix(hansbug): try fix the bug in docs when __doc__ is None

---
 treetensor/utils/doc.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/treetensor/utils/doc.py b/treetensor/utils/doc.py
index 10261f36f..a2782041e 100644
--- a/treetensor/utils/doc.py
+++ b/treetensor/utils/doc.py
@@ -6,8 +6,8 @@ __all__ = [
 ]
 
 
-def _strip_lines(doc: str):
-    _lines = doc.strip().splitlines()
+def _strip_lines(doc: Optional[str]):
+    _lines = (doc or '').strip().splitlines()
     _exist_lines = list(filter(str.strip, _lines))
 
     if not _exist_lines:
-- 
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