fix: allow pypi packages with empty data attribute (#3463)

An empty glob under site-packages (after excluding code and pyi files)
is a bit strange,
but not actually incorrect. If such a situation occurs, it would cause a
failure because
Bazel has since changed to disallow empty globs by default.

To fix, just set allow_empty=True on the data glob.

Author: rickeylev

python/private/pypi/whl_library_targets.bzl

@@ -356,6 +356,7 @@ def whl_library_targets(
         data = data + native.glob(
             ["site-packages/**/*"],
             exclude = _data_exclude,
+            allow_empty = True,
         )
 
         pyi_srcs = native.glob(

tests/pypi/whl_library_targets/whl_library_targets_tests.bzl

@@ -275,6 +275,7 @@ def _test_whl_and_library_deps_from_requires(env):
                 "**/*.pyc.*",
                 "**/*.dist-info/RECORD",
             ],
+            allow_empty = True,
         ),
         # pyi call
         _glob_call(["site-packages/**/*.pyi"], allow_empty = True),
@@ -457,7 +458,7 @@ def _test_group(env):
             "**/*.pyc",
             "**/*.pyc.*",
             "**/*.dist-info/RECORD",
-        ]),
+        ], allow_empty = True),
         _glob_call(["site-packages/**/*.pyi"], allow_empty = True),
     ])