File skip-network-tests.patch of Package python-checkdmarc

diff --git a/tests.py b/tests.py
index fd22132..b684ecb 100755
--- a/tests.py
+++ b/tests.py
@@ -291,6 +291,7 @@ class Test(unittest.TestCase):
             "{0} does not have any MX records".format(domain), results["warnings"]
         )
 
+    @unittest.skipUnless(os.path.exists("/etc/resolv.conf"), "no network")
     def testSPFMissingARecord(self):
         """A warning is issued if an SPF record contains a mx mechanism
         pointing to a domain that has no A records"""