Merge remote-tracking branch 'origin/master' into grid

Change-Id: Ic7629f9cedb3c948edf4f63c678ca499e3d52805

1 files changed, 9 insertions, 4 deletions

diff --git a/client-compiler/src/com/vaadin/tools/CvalChecker.java b/client-compiler/src/com/vaadin/tools/CvalChecker.java
index b3345c7658..645667be94 100644
--- a/client-compiler/src/com/vaadin/tools/CvalChecker.java
+++ b/client-compiler/src/com/vaadin/tools/CvalChecker.java
@@ -35,16 +35,17 @@ import java.util.prefs.Preferences;
 import org.apache.commons.io.IOUtils;
 
 import elemental.json.JsonException;
+import elemental.json.JsonNull;
 import elemental.json.JsonObject;
 import elemental.json.impl.JsonUtil;
 
 /**
  * This class is able to validate the vaadin CVAL license.
- * 
+ *
  * It reads the developer license file and asks the server to validate the
  * licenseKey. If the license is invalid it throws an exception with the
  * information about the problem and the server response.
- * 
+ *
  * @since 7.3
  */
 public final class CvalChecker {
@@ -80,6 +81,10 @@ public final class CvalChecker {
         private static <T> T get(JsonObject o, String k, Class<T> clz) {
             Object ret = null;
             try {
+                if (o == null || o.get(k) == null
+                        || o.get(k) instanceof JsonNull) {
+                    return null;
+                }
                 if (clz == String.class) {
                     ret = o.getString(k);
                 } else if (clz == JsonObject.class) {
@@ -299,7 +304,7 @@ public final class CvalChecker {
 
     /**
      * Given a product name returns the name of the file with the license key.
-     * 
+     *
      * Traditionally we have delivered license keys with a name like
      * 'vaadin.touchkit.developer.license' but our database product name is
      * 'vaadin-touchkit' so we have to replace '-' by '.' to maintain
@@ -340,7 +345,7 @@ public final class CvalChecker {
 
     /**
      * Validate whether there is a valid license key for a product.
-     * 
+     *
      * @param productName
      *            for example vaadin-touchkit
      * @param productVersion