[gtk-doc] xsl: Enable ToC generation on empty <toc/> elements

[Stefan Kost <stefkost src gnome org>]

commit b756620ed4cdddf65e8628fdaafd4cd36bdde423
Author: Emanuele Aina <emanuele aina collabora com>
Date:   Sat Apr 25 17:52:29 2015 +0200

    xsl: Enable ToC generation on empty <toc/> elements
    
    When a section grows longer, it may be useful to include a table of
    content at the top. By processing empty <toc/> elements to automatically
    generate a proper table of contents we let authors to customize the
    behaviour case-by-case.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=748456

 gtk-doc-single.xsl |    1 +
 gtk-doc.xsl        |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk-doc-single.xsl b/gtk-doc-single.xsl
index 7d9efc6..3e12ccb 100644
--- a/gtk-doc-single.xsl
+++ b/gtk-doc-single.xsl
@@ -21,6 +21,7 @@
     part       toc
     reference toc
   </xsl:param>
+  <xsl:param name="process.empty.source.toc">1</xsl:param>
 
   <xsl:param name="default.encoding" select="'UTF-8'"/>
   <xsl:param name="chapter.autolabel" select="0"/>
diff --git a/gtk-doc.xsl b/gtk-doc.xsl
index 9f3f3e1..55b1813 100644
--- a/gtk-doc.xsl
+++ b/gtk-doc.xsl
@@ -30,6 +30,7 @@
     part       toc
     reference toc
   </xsl:param>
+  <xsl:param name="process.empty.source.toc">1</xsl:param>
 
   <xsl:param name="chunker.output.encoding" select="'UTF-8'"/>
   <xsl:param name="chunker.output.indent" select="'yes'"/>