fix(server-core): Handle empty query in getSqlGenerator #3705

Job	Run time
latest-tag-sha	25s
Build native Linux 20 x86_64-unknown-linux-gnu Python fallback	7m 26s
build	6m 57s
tests (20.x, athena-export-bucket-s3)	19m 35s
tests (20.x, bigquery-export-bucket-gcs)	9m 32s
tests (20.x, clickhouse)	5m 36s
tests (20.x, clickhouse-export-bucket-s3)	5m 20s
tests (20.x, databricks-jdbc)	6m 27s
tests (20.x, databricks-jdbc-export-bucket-s3)	6m 52s
tests (20.x, databricks-jdbc-export-bucket-azure)	7m 20s
tests (20.x, mssql)	5m 33s
tests (20.x, mysql)	5m 14s
tests (20.x, postgres)	5m 21s
tests (20.x, redshift)	6m 2s
tests (20.x, redshift-export-bucket-s3)	5m 56s
tests (20.x, snowflake)	5m 39s
tests (20.x, snowflake-export-bucket-s3)	6m 47s
tests (20.x, snowflake-export-bucket-azure)	5m 36s
tests (20.x, snowflake-export-bucket-azure-via-storage-integration)	5m 36s
tests (20.x, snowflake-export-bucket-gcs)	5m 43s
	2h 12m 57s

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