fix(server-core): Handle empty query in getSqlGenerator #3706

Job	Run time
latest-tag-sha	28s
Build native Linux 20 x86_64-unknown-linux-gnu Python fallback	2m 44s
build	7m 18s
tests (20.x, athena-export-bucket-s3)	19m 6s
tests (20.x, bigquery-export-bucket-gcs)	9m 24s
tests (20.x, clickhouse)	5m 54s
tests (20.x, clickhouse-export-bucket-s3)	5m 25s
tests (20.x, databricks-jdbc)	6m 35s
tests (20.x, databricks-jdbc-export-bucket-s3)	6m 35s
tests (20.x, databricks-jdbc-export-bucket-azure)	6m 31s
tests (20.x, mssql)	5m 39s
tests (20.x, mysql)	5m 11s
tests (20.x, postgres)	5m 41s
tests (20.x, redshift)	7m 0s
tests (20.x, redshift-export-bucket-s3)	6m 55s
tests (20.x, snowflake)	5m 49s
tests (20.x, snowflake-export-bucket-s3)	6m 29s
tests (20.x, snowflake-export-bucket-azure)	6m 4s
tests (20.x, snowflake-export-bucket-azure-via-storage-integration)	6m 4s
tests (20.x, snowflake-export-bucket-gcs)	5m 46s
	2h 10m 38s

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