[gnome-books/wip/hadess/no-doc-xdg-user-dir] overview: Handle unset documents xdg-user-dir

[Bastien Nocera <hadess src gnome org>]

commit 504b66f6cec4b7a7bb46ca7a3b27a47ffb6a424b
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Sep 20 12:31:35 2019 +0200

    overview: Handle unset documents xdg-user-dir
    
    Don't crash if the documents xdg-user-dir is unset on badly installed
    systems.
    
    JS ERROR: Exception in callback for signal: window-mode-changed: Error: Argument 'path' (type filename) 
may not be null
    _addSecondaryLabel@resource:///org/gnome/Books/js/overview.js:308:23
    
    Closes: #39

 src/overview.js | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/overview.js b/src/overview.js
index 18a51f1a..a1b0d246 100644
--- a/src/overview.js
+++ b/src/overview.js
@@ -305,6 +305,8 @@ const EmptyResultsBox = new Lang.Class({
             let docsPath, docsUrl;
 
             docsPath = GLib.get_user_special_dir(GLib.UserDirectory.DIRECTORY_DOCUMENTS);
+            if (!docsPath)
+                docsPath = GLib.get_home_dir();
             docsUrl = Gio.file_new_for_path(docsPath).get_uri();
             useMarkup = true;
             /* translators: %s is the location of the Documents folder.*/