[gtk-doc] mkhtml2: handle deprecated without description keywords for devhelp2

[Stefan Sauer <stefkost src gnome org>]

commit 37526398947a65acb39c4051603672c45afe4c97
Author: LRN <lrn1986 gmail com>
Date:   Fri Mar 30 21:05:59 2018 +0200

    mkhtml2: handle deprecated without description keywords for devhelp2
    
    If there is no value, split() returns 1-element list.
    
    See https://bugzilla.gnome.org/show_bug.cgi?id=788911

 gtkdoc/mkhtml2.py |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/gtkdoc/mkhtml2.py b/gtkdoc/mkhtml2.py
index b9c3921..a6d4b43 100644
--- a/gtkdoc/mkhtml2.py
+++ b/gtkdoc/mkhtml2.py
@@ -1151,7 +1151,14 @@ def create_devhelp2_condition_attribs(node):
     if 'condition' in node.attrib:
         # condition -> since, deprecated, ... (separated with '|')
         cond = node.attrib['condition'].replace('"', '&quot;').split('|')
-        return' ' + ' '.join(['%s="%s"' % tuple(c.split(':', 1)) for c in cond])
+        keywords = []
+        for c in cond:
+            if ':' in c:
+                keywords.append('{}="{}"'.format(*c.split(':', 1)))
+            else:
+                # deprecated can have no description
+                keywords.append('{}="{}"'.format(c, ''))
+        return ' ' + ' '.join(keywords)
     else:
         return ''