Do not throw NPE if conversion messages is null (#12962)

Change-Id: Ie2b95ed4da89e2c5ab8b462300a6f4bd28dc7570

1 files changed, 15 insertions, 0 deletions

diff --git a/server/tests/src/com/vaadin/tests/server/component/abstractfield/AbsFieldValueConversionError.java b/server/tests/src/com/vaadin/tests/server/component/abstractfield/AbsFieldValueConversionError.java
index ad762f8931..887f1b8ff3 100644
--- a/server/tests/src/com/vaadin/tests/server/component/abstractfield/AbsFieldValueConversionError.java
+++ b/server/tests/src/com/vaadin/tests/server/component/abstractfield/AbsFieldValueConversionError.java
@@ -54,6 +54,21 @@ public class AbsFieldValueConversionError extends TestCase {
 
     }
 
+    public void testNullConversionMessages() {
+        TextField tf = new TextField();
+        tf.setConverter(new StringToIntegerConverter());
+        tf.setPropertyDataSource(new MethodProperty<String>(paulaBean, "age"));
+        tf.setConversionError(null);
+        tf.setValue("abc");
+        try {
+            tf.validate();
+            fail();
+        } catch (InvalidValueException e) {
+            Assert.assertEquals(null, e.getMessage());
+        }
+
+    }
+
     public void testDefaultConversionErrorMessage() {
         TextField tf = new TextField();
         tf.setConverter(new StringToIntegerConverter());