Fix adding cmdline option groups

2997e858 · Andrey Golovizin · ac2e5506 · 2997e858
Commit 2997e858 authored Aug 14, 2017 by Andrey Golovizin
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pybtex/cmdline.py pybtex/cmdline.py +2 -1

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--- a/pybtex/cmdline.py
+++ b/pybtex/cmdline.py
@@ -194,7 +194,8 @@ class CommandLine(object):
            if option_group is None:
                container = opt_parser
            else:
-                container = opt_parser.add_option_group(option_group)
+                container = optparse.OptionGroup(opt_parser, option_group)
+                opt_parser.add_option_group(container)
            for option in option_list:
                container.add_option(option)