Add check for empty list of schema #1131

Job	Run time
Detect which file has changed	7s
prepare-environment / prepare	2s
python-lint	5s
yaml-lint	0s
markdown-lint	0s
action-lint	0s
validate-generated-documentation	46s
validate-documentation-style	4s
unit-tests (3.9)	1m 10s
unit-tests (3.11)	1m 16s
unit-tests (3.12)	1m 37s
unit-tests (3.13)	4m 39s
unit-tests (3.10)	1m 20s
integration-tests-latest-infrahub	7m 21s
documentation	0s
	18m 27s

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