Rely on degenerate behavior in list.extend, as found in distutils.

e50f854c · Jason R. Coombs · edeee301 · e50f854c
Commit e50f854c authored Oct 14, 2016 by Jason R. Coombs
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setuptools/command/sdist.py setuptools/command/sdist.py +2 -3

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--- a/setuptools/command/sdist.py
+++ b/setuptools/command/sdist.py
@@ -150,9 +150,8 @@ class sdist(orig.sdist):

        optional = ['test/test*.py', 'setup.cfg']
        for pattern in optional:
-            files = list(filter(cs_path_exists, glob(pattern)))
-            if files:
-                self.filelist.extend(files)
+            files = filter(cs_path_exists, glob(pattern))
+            self.filelist.extend(files)

        # getting python files
        if self.distribution.has_pure_modules():