[Misc] Avoid NPE which can now happen after the fix for (XWIKI-10976: XE...

[Misc] Avoid NPE which can now happen after the fix for (XWIKI-10976: XE doesn't stop if there's a failure during the PersistentTestContext initialization)

xwiki-platform-core/xwiki-platform-test/src/main/java/org/xwiki/test/ui/PageObjectSuite.java

@@ -94,10 +94,12 @@ private void initializePersistentTestContext()
     @Override
     protected void afterTests()
     {
-        try {
-            context.shutdown();
-        } catch (Exception e) {
-            throw new RuntimeException("Failed to shutdown PersistentTestContext", e);
+        if (context != null) {
+            try {
+                context.shutdown();
+            } catch (Exception e) {
+                throw new RuntimeException("Failed to shutdown PersistentTestContext", e);
+            }
         }
 
         // Note: Don't call super.afterTests() since XWiki will be stopped twice otherwise!