Proper getBalance polling
Proper getBalance polling

The null value is `0x0`, not `0`.

charles-cooper/raiden,tomashaber/raiden,charles-cooper/raiden,tomaaron/raiden,tomashaber/raiden,hackaugusto/raiden,hackaugusto/raiden,tomaaron/raiden,tomaaron/raiden,tomashaber/raiden,tomashaber/raiden,tomashaber/raiden,tomaaron/raiden