fixed #4646 : distutils was choking on empty options arg in the setup function.
diff --git a/Lib/distutils/dist.py b/Lib/distutils/dist.py
index 9ad94fb..c15ca97 100644
--- a/Lib/distutils/dist.py
+++ b/Lib/distutils/dist.py
@@ -235,7 +235,7 @@
# command options will override any supplied redundantly
# through the general options dictionary.
options = attrs.get('options')
- if options:
+ if options is not None:
del attrs['options']
for (command, cmd_options) in options.items():
opt_dict = self.get_option_dict(command)