collect results if no block given

[Martin DeMello]

Fairly trivial, but it took me a couple of rounds of refactoring to hit
upon, so I thought I'd share it

def collect_nodes(index, set)
a = []
find_nodes(index, set) {|node| a << node}
a
end

def find_nodes(index, set)
return collect_nodes(index, set) unless block_given?
[rest of method]
end

Got rid of a lot of if block_given? clutter in the second method.

martin