馃悰 fix: heading for argument groups without a title - #350
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An argument group created with only a description rendered its heading as the program name followed by nothing, because the title was None, and every such group shared the label tool-None; two of them raised a duplicate label warning that fails builds run with -W. The description now serves as the heading when the title is missing, and a group with neither falls back to "arguments", so each section keeps a distinct, stable anchor. Titled groups are untouched.
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parser.add_argument_group(description="only a description")has no title, and the directive rendered it as a heading readingtoolwith the anchortool-None. A second untitled group produced a duplicate label warning on top, which fails any build running with-W. 馃悰An untitled group now takes its description as the heading text, so
tool only a descriptionandtool anotherget distinct anchors and the description no longer repeats as a paragraph under the heading. A group with neither title nor description falls back toarguments, giving it the stable anchortool-arguments. Titled groups render as before.