From 19ee0ac4c2b552f6358f33a86970c079f8293df5 Mon Sep 17 00:00:00 2001
From: Bas Couwenberg <sebastic@xs4all.nl>
Date: Tue, 17 Oct 2023 22:25:31 +0200
Subject: [PATCH] Fix test failure with built library (#291)

---
 rtree/finder.py | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/rtree/finder.py b/rtree/finder.py
index cf8c6ad8..10899bca 100644
--- a/rtree/finder.py
+++ b/rtree/finder.py
@@ -81,14 +81,15 @@ def load() -> ctypes.CDLL:
             # add path for binary wheel prepared with cibuildwheel/auditwheel
             try:
                 pkg_files = importlib.metadata.files("rtree")
-                for file in pkg_files:  # type: ignore
-                    if (
-                        file.parent.name == "Rtree.libs"
-                        and file.stem.startswith("libspatialindex")
-                        and ".so" in file.suffixes
-                    ):
-                        _candidates.insert(1, os.path.join(str(file.locate())))
-                        break
+                if pkg_files is not None:
+                    for file in pkg_files:  # type: ignore
+                        if (
+                            file.parent.name == "Rtree.libs"
+                            and file.stem.startswith("libspatialindex")
+                            and ".so" in file.suffixes
+                        ):
+                            _candidates.insert(1, os.path.join(str(file.locate())))
+                            break
             except importlib.metadata.PackageNotFoundError:
                 pass