Wrap draft chapter titles in a <div>

Fixes the problem of a missing space before the title of draft chapters,
due to the title not being wrapped in an `<a></a>`.

src/renderer/html_handlebars/helpers/toc.rs

@@ -108,8 +108,10 @@ impl HelperDef for RenderToc {
             }
 
             // Link
-            let path_exists = if let Some(path) = item.get("path") {
-                if !path.is_empty() {
+            let path_exists = if let Some(path) =
+                item.get("path")
+                    .and_then(|p| if p.is_empty() { None } else { Some(p) })
+            {
                 out.write("<a href=\"")?;
 
                 let tmp = Path::new(item.get("path").expect("Error: path should be Some(_)"))
@@ -131,9 +133,7 @@ impl HelperDef for RenderToc {
                 out.write(">")?;
                 true
             } else {
-                    false
-                }
-            } else {
+                out.write("<div>")?;
                 false
             };
 
@@ -165,6 +165,8 @@ impl HelperDef for RenderToc {
 
             if path_exists {
                 out.write("</a>")?;
+            } else {
+                out.write("</div>")?;
             }
 
             // Render expand/collapse toggle