Failure with very long series

Since version 1.5.10 the following fails:

asciiplot([1.]*1000, 80, 15)

With the following error:

ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

[pkazmier]

Works again, thanks for the instant turnaround!

[pkazmier]

This fix has broken asciichartpy for me. Plotting a series of 0 values will now return an empty string instead of a graph with 0 values plotted:

>>> plot([0,0,0,0])
''

By using any, a regular python list of 0 values will evaluate as False.

The simple fix here is to change:

if not any(series) or all(isnan(n) for n in series):

to explicitly check for the length of the series:

if len(series) == 0 or all(isnan(n) for n in series):