Test qlib from source slow

Fix the empty price_s case and self.instruments in SBBStrategyEMA. #1592

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Run time

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Job	Run time
build (windows-latest, 3.8)	2m 31s
build (windows-latest, 3.9)	2m 39s
build (windows-latest, 3.10)	2m 42s
build (windows-latest, 3.11)	2m 41s
build (windows-latest, 3.12)	2m 42s
build (ubuntu-20.04, 3.8)	2m 47s
build (ubuntu-20.04, 3.9)	2m 46s
build (ubuntu-20.04, 3.10)	2m 48s
build (ubuntu-20.04, 3.11)	2m 48s
build (ubuntu-20.04, 3.12)	2m 48s
build (ubuntu-22.04, 3.8)	2m 48s
build (ubuntu-22.04, 3.9)	2m 47s
build (ubuntu-22.04, 3.10)	2m 49s
build (ubuntu-22.04, 3.11)	2m 54s
build (ubuntu-22.04, 3.12)	2m 48s
build (macos-13, 3.8)	2m 49s
build (macos-13, 3.9)	2m 51s
build (macos-13, 3.10)	2m 51s
build (macos-13, 3.11)	2m 50s
build (macos-13, 3.12)	2m 50s
build (macos-14, 3.8)	2m 50s
build (macos-14, 3.9)	2m 45s
build (macos-14, 3.10)	2m 50s
build (macos-14, 3.11)	2m 37s
build (macos-14, 3.12)	2m 37s
build (macos-15, 3.8)	2m 51s
build (macos-15, 3.9)	2m 50s
build (macos-15, 3.10)	2m 47s
build (macos-15, 3.11)	2m 36s
build (macos-15, 3.12)	2m 37s
	1h 22m 49s