allow for TimeSeries with just timestamps specified #916

Job	Run time
conda-linux-gallery-python3.11-ros3	2m 21s
linux-gallery-python3.8-minimum	2m 4s
conda-linux-python3.11-ros3	2m 38s
linux-gallery-python3.11-upgraded	1m 55s
conda-linux-python3.8-minimum	20m 44s
windows-gallery-python3.8-minimum	2m 53s
linux-python3.8-minimum	24m 31s
conda-linux-python3.11-upgraded	19m 46s
windows-gallery-python3.11-upgraded	4m 4s
linux-python3.11-upgraded	21m 8s
windows-python3.8-minimum	23m 48s
windows-python3.11-upgraded	23m 13s
macos-python3.8-minimum	39m 32s
Deploy pre-release from dev	0s
	3h 8m 37s

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