[Fix-294] [admin] Fix to flink conf json bug

dlink-admin/src/main/java/com/dlink/dto/StudioExecuteDTO.java

@@ -5,6 +5,7 @@ import com.dlink.job.JobConfig;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
+
 import lombok.Getter;
 import lombok.Setter;
 
@@ -50,13 +51,15 @@ public class StudioExecuteDTO extends AbstractStatementDTO {
         if (Asserts.isNotNullString(configJson)) {
             try {
                 paras = mapper.readTree(configJson);
-            } catch (JsonProcessingException e) {
-                e.printStackTrace();
-            }
                 paras.forEach((JsonNode node) -> {
+                        if (!node.isNull()) {
                             config.put(node.get("key").asText(), node.get("value").asText());
                         }
+                    }
                 );
+            } catch (JsonProcessingException e) {
+                e.printStackTrace();
+            }
         }
         return new JobConfig(
             type, useResult, useChangeLog, useAutoCancel, useSession, session, clusterId,