Fix setup, checking if the entry_points section is present.

When the example `[entry_points]` section from the package template is
removed from the `setup.cfg`, this breaks.

setup.py

@@ -100,10 +100,11 @@
 # Define entry points for command-line scripts
 entry_points = {'console_scripts': []}
 
-entry_point_list = conf.items('entry_points')
-for entry_point in entry_point_list:
-    entry_points['console_scripts'].append('{0} = {1}'.format(entry_point[0],
-                                                              entry_point[1]))
+if conf.has_section('entry_points'):
+    entry_point_list = conf.items('entry_points')
+    for entry_point in entry_point_list:
+        entry_points['console_scripts'].append('{0} = {1}'.format(
+            entry_point[0], entry_point[1]))
 
 # Include all .c files, recursively, including those generated by
 # Cython, since we can not do this in MANIFEST.in with a "dynamic"