human
Solve the following python programming problem given the following code:
def require_existing_repo(func) : 
    "
        Checks to see if requested repository is available on user's deposit.
            Raises 404 if not.
    " 
    @ wraps (func) 
    def _decorator(request, * args, **kwargs) : 
        try : 
            user = User.objects.get (username = kwargs ['username']) 
            repo = Repository.objects.get (owner = user, name = kwargs ['repository']) 
            return func (request, * args, ** kwargs) 
except : 
            raise Http404 () 
return func 

    
    

    Fix the buggy line: return func
assistant
#Here is Python program to fix the buggy line: return func
.

return def _decorator(