logical_or should not be casting to an int

[vlsd]

This is an error we get if we try and logical_or timeseries that have None entries. Note that in python None is falsy, so bool(None) returns False. I would expected something called logical_* to cast to a boolean, if casting to anything.

  File "/src/traces/traces/timeseries.py", line 805, in logical_or
    return self.operation(other, lambda x, y: int(x or y))
  File "/src/traces/traces/timeseries.py", line 750, in operation
    result[time] = function(value, other[time])
  File "/src/traces/traces/timeseries.py", line 805, in <lambda>
    return self.operation(other, lambda x, y: int(x or y))
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'