优化getSparkVersion代码

Author: SunPengWan

dss-orchestrator/orchestrators/dss-workflow/dss-linkis-node-execution/src/main/java/com/webank/wedatasphere/dss/linkis/node/execution/service/impl/BuildJobActionImpl.java

@@ -284,19 +284,16 @@ private void enrichParams(Job job) {
     }
 
     private String getSparkVersion(Map<String, Object> params) {
-
         String sparkVersion = null;
-
-        if (params.get("configuration") != null) {
+        if (params.get("configuration") instanceof Map) {
             Map<String, Object> configurationMap = (Map<String, Object>) params.get("configuration");
-            if (configurationMap.get("runtime") != null) {
+            if (configurationMap.get("runtime") instanceof Map) {
                 Map<String, Object> runtimeMap = (Map<String, Object>) configurationMap.get("runtime");
-                if (runtimeMap.get("sparkVersion") != null) {
+                if (runtimeMap.get("sparkVersion") instanceof String) {
                     sparkVersion = (String) runtimeMap.get("sparkVersion");
                 }
             }
         }
-
         return sparkVersion;
     }