fix(接口测试): 修复SQL数据源为空时无法收到结果问题

--bug=1045163 --user=赵勇 [接口测试]github#32619运行环境中不配置数据源链接或配错误的链接并且用例中写了SQL脚本时，执行用例会卡死。 https://www.tapd.cn/55049933/s/1564930

Signed-off-by: fit2-zhao <yong.zhao@fit2cloud.com>

api-test/backend/src/main/java/io/metersphere/api/dto/definition/request/processors/post/MsJDBCPostProcessor.java

@@ -73,10 +73,15 @@ public class MsJDBCPostProcessor extends MsTestElement {
                 LoggerUtil.error(this.getName() + "，未找到数据源", JSONUtil.toJSONString(config));
             }
         }
+        if (this.dataSource == null) {
+            return;
+        }
+
         JDBCPostProcessor jdbcPostProcessor = jdbcPostProcessor(config);
         final HashTree samplerHashTree = tree.add(jdbcPostProcessor);
 
         tree.add(ElementUtil.jdbcDataSource(jdbcPostProcessor.getDataSource(), this.dataSource));
+
         ElementUtil.jdbcArguments(this.getName(), this.getVariables(), tree);
         if (CollectionUtils.isNotEmpty(hashTree)) {
             hashTree.forEach(el -> {

api-test/backend/src/main/java/io/metersphere/api/dto/definition/request/processors/pre/MsJDBCPreProcessor.java

@@ -7,7 +7,6 @@ import io.metersphere.api.dto.scenario.DatabaseConfig;
 import io.metersphere.api.dto.scenario.KeyValue;
 import io.metersphere.commons.constants.ElementConstants;
 import io.metersphere.commons.constants.RequestTypeConstants;
-import io.metersphere.commons.exception.MSException;
 import io.metersphere.commons.utils.BeanUtils;
 import io.metersphere.commons.utils.JSONUtil;
 import io.metersphere.commons.vo.JDBCProcessorVO;
@@ -74,6 +73,10 @@ public class MsJDBCPreProcessor extends MsTestElement {
             }
         }
 
+        if (this.dataSource == null) {
+            return;
+        }
+
         JDBCPreProcessor jdbcPreProcessor = jdbcPreProcessor(config);
         final HashTree samplerHashTree = tree.add(jdbcPreProcessor);
         // 数据源