bugfix: An empty POST body caused an error the first time Request.POS…

…T is accessed. See #67

bottle.py

@@ -389,7 +389,7 @@ def POST(self):
             data = cgi.FieldStorage(fp=self._environ['wsgi.input'],
                 environ=self._environ, keep_blank_values=True)
             self._POST  = {}
-            for item in data.list:
+            for item in data.list or []:
                 name = item.name
                 if not item.filename:
                     item = item.value