Add check the storage unit is not empty when create broadcast table rule #7745

Job	Run time
Import Global Environment / init-environment	3s
E2E - Agent with MySQL (proxy, tracing, jaeger)	9m 34s
E2E - Agent with MySQL (proxy, tracing, zipkin)	7m 53s
E2E - Agent with MySQL (proxy, metrics, prometheus)	6m 13s
E2E - Agent with MySQL (proxy, logging, file)	6m 8s
E2E - Agent with MySQL (jdbc, logging, file)	6m 15s
E2E - Agent with MySQL (jdbc, metrics, prometheus)	6m 8s
E2E - Agent with MySQL (jdbc, tracing, jaeger)	6m 20s
E2E - Agent with MySQL (jdbc, tracing, zipkin)	6m 16s
	54m 50s

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