hvplot.show() does not return the expected threading.Thread | Server object

[dogbunny]

ALL software version info

hvplot 0.8.4

Description of expected behavior and the observed behavior

calling hvplot.show() returns the threading.Thread or Server object (depending on whether threading is true or false)

The show method likely just needs to have a return added: https://github.com/holoviz/hvplot/blob/main/hvplot/utilities.py#L29

Complete, minimal, self-contained example code that reproduces the issue

import hvplot
import hvplot.pandas
import pandas as pd
import numpy as np

ts = pd.Series(np.random.randn(1000), index=pd.date_range('1/1/2000', periods=1000))
ts = ts.cumsum()
plot = ts.hvplot()
s = hvplot.show(plot, **{'threaded': True})
s.stop()

Stack traceback and/or browser JavaScript console output

In [12]: s.stop()

AttributeError Traceback (most recent call last)
Cell In[12], line 1
----> 1 s.stop()

AttributeError: 'NoneType' object has no attribute 'stop'

Screenshots or screencasts of the bug in action