Initialize empty Matplotlib pane #8565

Job	Run time
Run pre-commit	17s
UI tests on ubuntu-latest with Python 3.9	13m 25s
UI tests on macos-latest with Python 3.9	22m 43s
Core tests on Python 3.12, ubuntu-latest	4m 14s
UI tests on windows-latest with Python 3.9	24m 46s
Unit tests on ubuntu-latest with Python 3.9	7m 57s
Unit tests on ubuntu-latest with Python 3.11	7m 21s
Unit tests on macos-latest with Python 3.9	15m 27s
Unit tests on macos-latest with Python 3.11	9m 42s
Unit tests on windows-latest with Python 3.9	18m 42s
Unit tests on windows-latest with Python 3.11	17m 35s
	2h 22m 9s

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