https://github.com/cmusphinx/sphinxbase/commit/6989c52a3fb9473fd61326e548440fff887525c2

commit 6989c52a3fb9473fd61326e548440fff887525c2
Author: Michel Zou <xantares09@hotmail.com>
Date:   Thu Feb 6 07:02:06 2020 +0100

    Fix doxy2swig.py IndexError: list index out of range

diff --git a/doc/doxy2swig.py b/doc/doxy2swig.py
index 5589b0d..a01c4b1 100644
--- a/doc/doxy2swig.py
+++ b/doc/doxy2swig.py
@@ -299,7 +299,10 @@ class Doxy2SWIG:
             name = first['name'].firstChild.data
 
             for n in node.getElementsByTagName('param'):
-              arg_type = n.getElementsByTagName('type')[0]
+              elts = n.getElementsByTagName('type')
+              if len(elts) == 0:
+                  continue
+              arg_type = elts[0]
               ref = self.get_specific_nodes(arg_type, ('ref'))
               if 'ref' in ref:
                 type_name = ref['ref'].firstChild.data
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<div class='path'>path: <a href='/guix/log/?id=e2496a814f8ac4b62b91e05fc9899b9bb85b3ac4'>root</a>/<a href='/guix/log/doc?id=e2496a814f8ac4b62b91e05fc9899b9bb85b3ac4'>doc</a>/<a href='/guix/log/doc/fdl-1.3.texi?id=e2496a814f8ac4b62b91e05fc9899b9bb85b3ac4'>fdl-1.3.texi</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/doc/fdl-1.3.texi?id=e2496a814f8ac4b62b91e05fc9899b9bb85b3ac4&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-03-10 20:26:52 +0100'>2020-03-10</span></td><td><a href='/guix/commit/doc/fdl-1.3.texi?id=21656ffa3b6d78a610f0befced20cc9b4b3baab6'>doc: Use HTTPS for external links.</a><span class='msg-avail'>...</span></td><td>Vitaliy Shatrov</td></tr>