node copy error of part param

blade-service/blade-business/src/main/java/org/springblade/business/controller/InformationWriteQueryController.java

@@ -1981,9 +1981,13 @@ public class InformationWriteQueryController extends BladeController {
                     for (String k : colsList) {
                         if (p2.containsKey(k)) {
                             Object value = reviseValue(p2, k, origin.get(k));
-                            if (value != null && value.toString().contains("_^_")) {
-                                value = "'" + value + "'";
-                                target.set(target.indexOf(k), value.toString());
+                            if (value != null ) {
+                                if( value.toString().contains("_^_")) {
+                                    value = "'" + value + "'";
+                                    target.set(target.indexOf(k), value.toString());
+                                }else{
+                                    target.set(target.indexOf(k), StringPool.NULL);
+                                }
                             }
                         }
                     }