Add checks for setup.cfg existence in project dictionary

This check is needed by new projects at their first commit
Without this fix the following initial commit for new project
failed:
https://review.openstack.org/#/c/201701/

The exception that it failed was originated in this method
with KeyError on the project['setup.cfg'] (see previous
jenkins logs on the above commit)

Log: http://logs.openstack.org/01/201701/6/check/gate-kuryr-requirements/e922983/console.html

Change-Id: I39db2918ea277b939f67d3c856f52bd53c226f27

openstack_requirements/project.py

@@ -55,10 +55,12 @@ Verbose = collections.namedtuple('Verbose', ['message'])
 
 def extras(project):
     """Return a dict of extra-name:content for the extras in setup.cfg."""
+    if 'setup.cfg' not in project:
+        return {}
     c = configparser.SafeConfigParser()
     c.readfp(io.StringIO(project['setup.cfg']))
     if not c.has_section('extras'):
-        return dict()
+        return {}
     return dict(c.items('extras'))
 
 

openstack_requirements/tests/test_project.py

@@ -69,6 +69,10 @@ class TestProjectExtras(testtools.TestCase):
         proj = {'setup.cfg': u"[metadata]\n"}
         self.assertEqual({}, project.extras(proj))
 
+    def test_no_setup_cfg(self):
+        proj = {}
+        self.assertEqual({}, project.extras(proj))
+
 
 class TestExtrasParsing(testtools.TestCase):