better checking of head opts in template

des-des · des-des · commit 154197f5ebe9 · 2016-03-26T14:35:35.000Z
related: #25
diff --git a/src/templates.js b/src/templates.js
@@ -1,14 +1,14 @@
 const createAmpHeader = ({
   headOverride, style, canonicalUrl, title, extraHeadHTML
-}) => headOverride || (
+}) => typeof headOverride === 'string' ? headOverride : (
 `<!doctype html>
   <html amp>
     <head>
       <meta charset="utf-8">
       <link rel="canonical" href="${canonicalUrl || ""}" >
       <meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
       <style amp-custom>
-        ${style}
+        ${style || ""}
       </style>
       <style>body {opacity: 0}</style><noscript><style>body {opacity: 1}</style></noscript>
       <script async src="https://cdn.ampproject.org/v0.js"></script>
