Dont fail if summary doesn't exist

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/book.js b/lib/book.js
index acfaece..40c9686 100644
--- a/lib/book.js
+++ b/lib/book.js
@@ -205,12 +205,12 @@ Book.prototype.parse = function() {
         .then(that.summary.load)
         .then(function() {
             if (!that.summary.exists()) {
-                throw new error.FileNotFoundError({ filename: 'SUMMARY' });
+                that.log.warn.ln('no summary file in this book');
             }
 
             // Index summary's articles
             that.summary.walk(function(article) {
-                if (!article.hasLocation()) return;
+                if (!article.hasLocation() || article.isExternal()) return;
                 that.addPage(article.path);
             });
         })