fix(ui): NPE on notEqualsIdentityName validators

Signed-off-by: Marcello Rinaldo Martina <martina.marcello.rinaldo@outlook.com>

Author: marcellorinaldo

bundles/org.eclipse.kura.web2/src/main/java/org/eclipse/kura/web/client/ui/validator/GwtValidators.java

@@ -98,7 +98,13 @@ public static Validator<String> nonEmpty(final String message) {
     }
 
     public static Validator<String> notEqualsIdentityName(final String identityName, final String message) {
-        return new ValidatorWrapper<>(new PredicateValidator(v -> !v.equalsIgnoreCase(identityName), message), Priority.MEDIUM);
+        return new ValidatorWrapper<>(new PredicateValidator(v -> {
+            if (v == null) {
+                return true;
+            }
+
+            return !v.equalsIgnoreCase(identityName);
+        }, message), Priority.MEDIUM);
     }
 
     public static <T> Validator<T> notInList(final List<T> values, final String message) {

bundles/org.eclipse.kura.web2/src/main/java/org/eclipse/kura/web/shared/validator/PasswordStrengthValidators.java

@@ -90,7 +90,13 @@ private static Validator<String> containsBothCases(final Messages messages) {
     private static Validator<String> requireDifferentNameAndPassword(final String identityName,
             final Messages messages) {
 
-        return new PredicateValidator(v -> !v.equalsIgnoreCase(identityName), messages.pwdNotEqualsUsername());
+        return new PredicateValidator(v -> {
+            if (v == null) {
+                return true;
+            }
+
+            return !v.equalsIgnoreCase(identityName);
+        }, messages.pwdNotEqualsUsername());
     }
 
     public interface Messages {