Merge pull request #9 from caio92/master

fixed config_parser.py

mininet/conf_parser.py

@@ -30,8 +30,18 @@ def parse_hosts(conf_arq):
 
     hosts = []
 
+    items = config.items('nodes')
+	
+	#makes a first-pass read to nodes section to find empty nodes sections
+    for item in items:
+	name = item[0]
+	rest = item[1].split()
+	if len(rest) == 0:
+		config.set('nodes', name, '_')
+	#updates 'items' list
     items = config.items('nodes')
 
+	#makes a second-pass read to nodes section to properly add hosts
     for item in items:
 
         name = item[0]
@@ -110,6 +120,11 @@ def parse_links(conf_arq):
             break
 
         args = line.split()
+	
+	#checks for non-empty line
+	if len(args) == 0:
+		continue
+
         h1, h2 = args.pop(0).split(':')
 
         link_dict = {}