fix RoundupRequest:

the database must not be left open when an error is raised from the
constructor

Author: Alexander Smishlajev

roundup/xmlrpc.py

@@ -51,9 +51,11 @@ def __init__(self, tracker, username, password):
         try:
             userid = self.db.user.lookup(username)
         except KeyError: # No such user
+            self.db.close()
             raise Unauthorised, 'Invalid user.'
         stored = self.db.user.get(userid, 'password')
         if stored != password: # Wrong password
+            self.db.close()
             raise Unauthorised, 'Invalid user.'
         self.db.setCurrentUser(username)