CA-408841 rrd: don't call ds_update with an empty datasource array (#… #4209

Job	Run time
Test SDK builds / Generate SDK sources	4m 18s
Python tests (3.11)	3m 20s
Deprecation tests	6s
Finish coverage upload	6s
Test SDK builds / Build Java SDK	52s
Test SDK builds / Build C SDK	46s
Test SDK builds / Build C# SDK	2m 46s
Test SDK builds / Build PowerShell 7.x SDK (6)	1m 38s
Test SDK builds / Build PowerShell 5.x SDK (.NET Framework 4.5)	1m 43s
Test SDK builds / Build PowerShell 7.x SDK (8)	1m 38s
	17m 13s

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