From a10047e6f5f3c9ff2060272696f98dff8590b4de Mon Sep 17 00:00:00 2001
From: Jason Miller <developit@users.noreply.github.com>
Date: Tue, 28 Jan 2020 22:08:37 -0500
Subject: [PATCH] Don't emit prerender data script if there is none

One thing I haven't checked yet: will this cause prerender-data-provider to attempt to fetch prerender data because there's no script tag?
---
 packages/cli/lib/lib/webpack/render-html-plugin.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/cli/lib/lib/webpack/render-html-plugin.js b/packages/cli/lib/lib/webpack/render-html-plugin.js
index 2d08ec179..123c10513 100644
--- a/packages/cli/lib/lib/webpack/render-html-plugin.js
+++ b/packages/cli/lib/lib/webpack/render-html-plugin.js
@@ -93,7 +93,9 @@ module.exports = async function(config) {
 				return config.prerender ? prerender({ cwd, dest, src }, values) : '';
 			},
 			scriptLoading: 'defer',
-			CLI_DATA: { preRenderData: { url, ...routeData } },
+			CLI_DATA: Object.keys(routeData).length
+				? { preRenderData: { url, ...routeData } }
+				: undefined,
 		});
 	};