Fix class Plugin cannot be applied to given types

Change-Id: I51e2a817b7c80bbcaabc5d3c46ddaa90fe1e0cf3

src/main/java/com/googlesource/gerrit/plugins/zuul/client/ZuulPlugin.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/zuul/client/ZuulPlugin.java b/src/main/java/com/googlesource/gerrit/plugins/zuul/client/ZuulPlugin.java
index ddd80f8..ecd24df 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/zuul/client/ZuulPlugin.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/zuul/client/ZuulPlugin.java
@@ -28,6 +28,7 @@
 
     Plugin.get().panel(
         GerritUiExtensionPoint.CHANGE_SCREEN_BELOW_COMMIT_INFO_BLOCK,
-        new LabelPanel.Factory());
+        new LabelPanel.Factory(),
+        null);
   }
 }