remove all try/except

test/test_config_ip.py

@@ -70,6 +70,10 @@ def test_network():
     assert len(w) == 1
 
 
+def test_network_invalid():
+    raises(ValueError, "NetworkOption('a', '', default='toto')")
+
+
 def test_netmask():
     a = NetmaskOption('a', '')
     od = OptionDescription('od', '', [a])