Caused by: com.google.template.soy.base.SoySyntaxException: In file jar:file:/opt/data/gerrit/gerrit2/review_site/tmp/plugin_gitiles_150209_0906_2722847735254755368.jar!/com/google/gitiles/templates/Common.soy, template gitiles.header: Unsupported attribute 'variant' in 'call' command text "name="gitiles.customHeader" variant="$headerVariant ?: 'default'"".