Fix tableName regression.

Author: rkistner

packages/sync-rules/src/sql_filters.ts

@@ -613,8 +613,8 @@ export class SqlTools {
     }
     const tableName = ref.table?.name ?? this.default_table;
     if (this.value_tables.includes(tableName ?? '')) {
-      return ref.table!.name;
-    } else if (tableName == null) {
+      return tableName;
+    } else if (ref.table?.name == null) {
       throw new SqlRuleError(`Table name required`, this.sql, ref);
     } else {
       throw new SqlRuleError(`Undefined table ${tableName}`, this.sql, ref);