Delegate error handling of colormap to Matplotlib

[lisphilar]

Related issues

#1309

What was changed

Close #1309 by delegating error handling of colormap to Matplotlib.

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.34%.

Quality metrics	Before	After	Change
Complexity	0.45 ⭐	0.39 ⭐	-0.06 👍
Method Length	48.69 ⭐	47.67 ⭐	-1.02 👍
Working memory	6.02 ⭐	6.15 ⭐	0.13 👎
Quality	82.51% ⭐	82.17% ⭐	-0.34% 👎

Other metrics	Before	After	Change
Lines	118	108	-10

Changed files	Quality Before	Quality After	Quality Change
covsirphy/visualization/scatter_plot.py	80.00% ⭐	80.69% ⭐	0.69% 👍
tests/test_visualization/test_scatter.py	87.01% ⭐	85.56% ⭐	-1.45% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
covsirphy/visualization/scatter_plot.py	ScatterPlot.line_straight	3 ⭐	101 🙂	12 😞	62.24% 🙂	Extract out complex expressions

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