Don't try to find closest match if input is empty

[hoxbro]

Fixes #5694

The function is recursive, and if the input arguments are not the same length, it will raise the error described in the issue.

This PR just adds a check to see if the match is not empty. There seems to be a problem with the coloring when having 1 vs 2 or 3. I will not fix that in this PR.

Code

import holoviews as hv
import numpy as np
import panel as pn

pn.extension()

def sine(ncurves):
    hv_curves = []
    for i in range(ncurves):
        frequency = 2.0
        xs = np.linspace(0.0, 1.0, 500)
        ys = np.sin((i + 1) * frequency * xs) # just a sine wave

        curve = hv.Curve((xs, ys), label="A")
        hv_curves.append(curve)

        ys = 1.1 * np.sin((i + 1) * frequency * xs)  # another, bigger amplitude
        curve = hv.Curve((xs, ys), label="B")
        hv_curves.append(curve)

        ys = 1.2 * np.sin((i + 1) * frequency * xs)  # still another
        curve = hv.Curve((xs, ys), label="C")
        hv_curves.append(curve)

    overlay = hv.Overlay(hv_curves)
    return overlay


ncurves = pn.widgets.IntSlider(name="NCurves", start=1, end=3, value=1).servable()
col = pn.Column(
    ncurves, hv.DynamicMap(pn.bind(sine, ncurves=ncurves)), width=500, height=500
).servable()

screenrecord-2023-04-28_10.48.21.mp4

[codecov-commenter]

Codecov Report

Merging #5700 (9b1dcf4) into main (c74191d) will decrease coverage by 0.01%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main    #5700      +/-   ##
==========================================
- Coverage   88.30%   88.30%   -0.01%     
==========================================
  Files         302      302              
  Lines       62603    62605       +2     
==========================================
  Hits        55281    55281              
- Misses       7322     7324       +2     

Impacted Files	Coverage Δ
holoviews/core/util.py	86.54% <80.00%> (-0.06%)	⬇️

... and 1 file with indirect coverage changes

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[philippjfr]

Looks good.

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.