message: fix: calendar heatmap examples
  Fixing a set of examples that trip on ValueError vs TypeError
diff: @@ -213,7 +213,7 @@ class BaseViz(object):
  try:
  int(one_ts_val)
  is_integral = True
  - except ValueError:
  + except (ValueError, TypeError):
  is_integral = False
  if is_integral:
  unit = 's' if timestamp_format == 'epoch_s' else 'ms'
  