From 4f4120b5a400f13f8162b4266be4a06e6fae5262 Mon Sep 17 00:00:00 2001
From: Corey Farwell <coreyf@rwell.org>
Date: Thu, 27 Apr 2017 09:16:19 -0400
Subject: [PATCH] Fix incorrect conditional.

I accidentally introduced this in https://github.com/azerupi/mdBook/pull/254/commits/4525810737b678e00c23f26c218db5426df0d714.
---
 src/book/mod.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/book/mod.rs b/src/book/mod.rs
index d2c5ae4e..85d20a79 100644
--- a/src/book/mod.rs
+++ b/src/book/mod.rs
@@ -185,7 +185,7 @@ impl MDBook {
                 BookItem::Chapter(_, ref ch) |
                 BookItem::Affix(ref ch) => ch,
             };
-            if ch.path.as_os_str().is_empty() {
+            if !ch.path.as_os_str().is_empty() {
                 let path = self.src.join(&ch.path);
 
                 if !path.exists() {