Variable amount of snippet arguments in ultisnips plugin

Hi,

I discovered the plugin ultisnips and like it a lot. However, I have
problems setting up the snippets (BTW: I don't know python). I need
a snippet that has two mandatory arguments and several optional ones
(no more than four). Here an example:

snippet def "def"
def ${1:${VISUAL:foo}}
{${2}} {${3}} {${4}}
$0
endsnippet

Typing def <Tab> foo <C-J>bar<C-J><C-J><C-J> yields

def foo
{bar} {} {}

I don't need the last two braces. How can I omit the empty braces in
this example without defining a snippet for each number of braces?


Marco


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