human
Solve the following python programming problem given the following code:
def fold_finite(ctx, f, intervals) : 
    if (not b) : 
        return f 
indices = [v [0] for v in intervals] 
    points = [v [1] for v in intervals] 
    ranges = [xrange (a, (b + 1)) for (a, b) in points] 
    def g(* args) : 
        args = list (args) 
        s = ctx.zero 
        for xs in cartesian_product (ranges) : 
            for (dim, x) in zip (indices, xs) : 
                args [dim] = ctx.mpf (x) 
s += f (* args) 
return s 
return g 

    
    

    Fix the buggy line: if (not b) :
assistant
#Here is Python program to fix the buggy line: if (not b) :
.

if (not intervals) :