Prevent NPE in comparison (#12218) (#12230)

* Prevent NPE in comparison (#12218)

Fixes: https://github.com/vaadin/framework/issues/12207

server/src/main/java/com/vaadin/data/Binder.java

@@ -1286,7 +1286,7 @@ public class Binder<BEAN> implements Serializable {
                     setter.accept(bean, value);
                     if (value != null) {
                         FIELDVALUE converted = convertToFieldType(value);
-                        if (!field.getValue().equals(converted)) {
+                        if (!Objects.equals(field.getValue(), converted)) {
                             getField().setValue(converted);
                         }
                     }