--- a/setup.py	2022-05-15 19:33:42.938456878 +0200
+++ b/setup.py	2022-05-15 19:33:57.869231488 +0200
@@ -35,7 +35,7 @@
     def run(self):
         # package_dir may be None, in that case use the current directory.
         import os
-        if self.distribution.package_dir is None:
+        if not self.distribution.package_dir:
             src_dir = os.getcwd()
         else:
             src_dir = os.path.abspath(self.distribution.package_dir[""])