fix validator in java 17

persist/src/main/java/lcsb/mapviewer/persist/ObjectValidator.java

@@ -205,12 +205,14 @@ public class ObjectValidator {
         @Override
         public void doWith(final Field arg0) {
           try {
+            // skip static
+            if (java.lang.reflect.Modifier.isStatic(arg0.getModifiers())) {
+              return;
+            }
             arg0.setAccessible(true);
             Object property = arg0.get(object);
             if (isIgnoredClass(arg0.getType())) {
               // skip
-            } else if (java.lang.reflect.Modifier.isStatic(arg0.getModifiers())) {
-              // skip static
             } else if (property == null
                 || property instanceof String
                 || property instanceof Double