Merge pull request #2316 from FOCONIS/pr/bugfix/json-null-formatValue

Fix: setting json values to null was throwing a NPE when persisting

ebean-core/src/main/java/io/ebeaninternal/server/type/ScalarTypeJsonList.java

@@ -122,9 +122,6 @@ class ScalarTypeJsonList {
 
     @Override
     public final String formatValue(List value) {
-      if (value.isEmpty()) {
-        return "[]";
-      }
       try {
         return EJson.write(value);
       } catch (IOException e) {

ebean-core/src/main/java/io/ebeaninternal/server/type/ScalarTypeJsonSet.java

@@ -122,9 +122,6 @@ final class ScalarTypeJsonSet {
 
     @Override
     public final String formatValue(Set value) {
-      if (value.isEmpty()) {
-        return "[]";
-      }
       try {
         return EJson.write(value);
       } catch (IOException e) {