ndscope 0.9.1 crashes when displaying signed integer channels
https://cdswiki.ligo-wa.caltech.edu/wiki/NdscopeTestVersion_0_9_1
david.barker@opslogin0: ndscope_test H1:FEC-29_CPU_METER
Traceback (most recent call last):
File "/usr/local/lib/ndscope/ndscope/scope.py", line 710, in _update_plots
plot.update(data, self.t0)
File "/usr/local/lib/ndscope/ndscope/plot.py", line 200, in update
cc.set_data(cd, t0)
File "/usr/local/lib/ndscope/ndscope/plot.py", line 363, in set_data
y=hold_over_nan(y),
File "/usr/local/lib/ndscope/ndscope/plot.py", line 40, in hold_over_nan
out[:] = np.nan
ValueError: cannot convert float NaN to integer
Aborted