Commits on Feb 15, 2020

1. Add a case for an empty book_title parameter …

   Html page title for every chapter in the book is created by the following code:
   ```rust
   let title: String;
   {
   	let book_title = ctx
   	.data
   	.get("book_title")
   	.and_then(serde_json::Value::as_str)
   	.unwrap_or("");
   
   	title = ch.name.clone() + " - " + book_title;
   }
   ```
   
   If the `book.toml` file is missing, and `book_title` parameter is empty, there's an awkward ` - ` string hanging at the end of each chapter's title.
   
   This PR adds a `match` case to handle that kind of situation.

   

   tomasz-rozanski committed Feb 15, 2020
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