Set last_error on error

lib/htlogr.py

         self.url = url
         self.parsed_url = urlparse.urlparse(url)
         self.conn = httplib.HTTPConnection(self.parsed_url.hostname)
+        self.last_error = None
 
     def _zipup_params(self, params):
         args = []
         params = {"msg": msg, "tag": tag, "i": i}
         pq = "%s?%s" % (self.parsed_url.path, self._zipup_params(params))
         self.conn.request("GET", pq)
+        self.last_error = None
         return_msg = None
         try:
             r = self.conn.getresponse()
         except httplib.BadStatusLine as e:
             return_msg = ("httplib does not like this line:\n\n    %s"
                           % e.line)
+            self.last_error = return_msg
         return return_msg
 
     def data(self, data, tag=None, i=None):