[glib] glib-mkenums: Add default comment template if none is provided

[Philip Withnall <pwithnall src gnome org>]

commit fcfbaf8566911a70434f876a9e76912f7db19dcd
Author: Philip Withnall <withnall endlessm com>
Date:   Thu Oct 19 10:15:49 2017 +0100

    glib-mkenums: Add default comment template if none is provided
    
    The fallback code for providing a default comment template only worked
    if a template file was provided. It didn’t work if individual templates
    were provided on the command line (and --comment wasn’t).
    
    Signed-off-by: Philip Withnall <withnall endlessm com>
    
    https://bugzilla.gnome.org/show_bug.cgi?id=788990

 gobject/glib-mkenums.in |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/gobject/glib-mkenums.in b/gobject/glib-mkenums.in
index 6f365c2..7cc5505 100755
--- a/gobject/glib-mkenums.in
+++ b/gobject/glib-mkenums.in
@@ -281,10 +281,6 @@ def read_template_file(file):
     vtail = tmpl['value-tail']
     comment_tmpl = tmpl['comment']
 
-    # default to C-style comments
-    if comment_tmpl == "":
-        comment_tmpl = "/* \u0040comment\u0040 */"
-
 parser = argparse.ArgumentParser(epilog=help_epilog,
                                  formatter_class=argparse.RawDescriptionHelpFormatter)
 
@@ -366,6 +362,9 @@ vtail = vtail + ''.join([unescape_cmdline_args(x) for x in options.vtail])
 
 if options.comment_tmpl != '':
     comment_tmpl = unescape_cmdline_args(options.comment_tmpl)
+elif comment_tmpl == "":
+    # default to C-style comments
+    comment_tmpl = "/* \u0040comment\u0040 */"
 
 output = options.output