Fix lines that depend on the 'networks' key being in values list

autocompose.py

@@ -80,11 +80,11 @@ def generate(cname):
         'tty': cattrs['Config']['Tty']
     }
 
+    networks = {}
     if values['networks'] == set():
         del values['networks']
-    
+    else:
         networklist = c.networks.list()
-    networks = {}
         for network in networklist:
             if network.attrs['Name'] in values['networks']:
                 networks[network.attrs['Name']] = {'external': (not network.attrs['Internal'])}