silx.io.fioh5: Improved handling of missing data entries #1698

Job	Run time
Python 3.8 on ubuntu-20.04 PyQt5	10m 51s
Python 3.11 on ubuntu-latest PyQt6	8m 55s
Python 3.12 on ubuntu-latest PySide6	6m 48s
Python 3.10 on macos-13 PyQt5	15m 28s
Python 3.12 on macos-13 PyQt6	20m 39s
Python 3.9 on macos-13 PySide6	9m 27s
Python 3.9 on windows-latest PyQt5	9m 3s
Python 3.12 on windows-latest PyQt6	8m 54s
Python 3.10 on windows-latest PySide6	4m 40s
	1h 34m 45s

Provide feedback