From 076f41759ceacb1a804517270392f0ef75adb07f Mon Sep 17 00:00:00 2001
From: Marcel Hellkamp <marc@gsites.de>
Date: Thu, 13 Dec 2018 08:26:27 +0100
Subject: fix #1115: Some modules set __file__ as None

This is not allowed (the __file__ attribute MUST be either a string, or unset),
but seems to happen anyway and is easy to work around in bottle.
---
 bottle.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bottle.py b/bottle.py
index 01b581e..f254bac 100644
--- a/bottle.py
+++ b/bottle.py
@@ -3156,7 +3156,7 @@ class FileCheckerThread(threading.Thread):
         files = dict()
 
         for module in list(sys.modules.values()):
-            path = getattr(module, '__file__', '')
+            path = getattr(module, '__file__', '') or ''
             if path[-4:] in ('.pyo', '.pyc'): path = path[:-1]
             if path and exists(path): files[path] = mtime(path)
 
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