dillon1000/react

Allow falsy values in statics

We found that the component would break if we set any statics with the
value 0. It turns out @chenglou already ran into this with
d71736b3ed665d1ffcd0c34a55510ce266a30eb2 but the statics code was copied
earlier, and still has this falsy check. Made the same change, updated
the unittest.