Fix NPE in test

Change-Id: I6d4615ee959ab531218111045770854f0b2263ee
diff --git a/tests/org.eclipse.graphiti.bot.tests/src/org/eclipse/graphiti/bot/tests/PluginWizardTests.java b/tests/org.eclipse.graphiti.bot.tests/src/org/eclipse/graphiti/bot/tests/PluginWizardTests.java
index 26e2740..8e4e32e 100644
--- a/tests/org.eclipse.graphiti.bot.tests/src/org/eclipse/graphiti/bot/tests/PluginWizardTests.java
+++ b/tests/org.eclipse.graphiti.bot.tests/src/org/eclipse/graphiti/bot/tests/PluginWizardTests.java
@@ -123,6 +123,7 @@
 		IPluginModelBase newPluginModel = PluginRegistry.findModel(newProject);
 		counter = 0;
 		while ((newPluginModel == null || newPluginModel.getPluginBase() == null) && counter < 20) {
+			newPluginModel = PluginRegistry.findModel(newProject);
 			counter++;
 			Thread.sleep(1000);
 		}