From 591e5422eafa89b277a59ef1651552d7b6304698 Mon Sep 17 00:00:00 2001
From: Sergey Mishin <sergey@chorus.one>
Date: Thu, 14 Mar 2024 22:26:59 +0100
Subject: [PATCH] Handle modules with __file__ property being None

It's been discovered that some modules have the `__file__` property
being set as `None`. An example of a such module is `backports`.

Providing `None` to `os.path.abspath()` causes an exception:
`TypeError: expected str, bytes or os.PathLike object, not NoneType`

Related to https://github.com/mitogen-hq/mitogen/issues/946
---
 mitogen/master.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mitogen/master.py b/mitogen/master.py
index b1e0a1de..db12229d 100644
--- a/mitogen/master.py
+++ b/mitogen/master.py
@@ -148,7 +148,11 @@ def is_stdlib_name(modname):
         return False
 
     # six installs crap with no __file__
-    modpath = os.path.abspath(getattr(module, '__file__', ''))
+    path = getattr(module, '__file__', '')
+    if path is None:
+        path = ''
+
+    modpath = os.path.abspath(path)
     return is_stdlib_path(modpath)