[8041] check documentlanguage defined

[gavinsmith0123]

Revision: 8041
          http://svn.sv.gnu.org/viewvc/?view=rev&root=texinfo&revision=8041
Author:   gavin
Date:     2018-08-10 11:41:24 -0400 (Fri, 10 Aug 2018)
Log Message:
-----------
check documentlanguage defined

Modified Paths:
--------------
    trunk/tp/parsetexi/Parsetexi.pm

Modified: trunk/tp/parsetexi/Parsetexi.pm
===================================================================
--- trunk/tp/parsetexi/Parsetexi.pm     2018-08-10 15:34:07 UTC (rev 8040)
+++ trunk/tp/parsetexi/Parsetexi.pm     2018-08-10 15:41:24 UTC (rev 8041)
@@ -174,7 +174,9 @@
           add_expanded_format ($f);
         }
       } elsif ($key eq 'documentlanguage') {
-        set_documentlanguage ($conf->{$key});
+        if (defined ($conf->{$key})) {
+          set_documentlanguage ($conf->{$key});
+        }
       } elsif ($key eq 'SHOW_MENU') {
         conf_set_show_menu ($conf->{$key});
       } elsif ($key eq 'CPP_LINE_DIRECTIVES') {