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submodule summary: Don't barf when invoked in an empty repo
When invoking "git submodule summary" in an empty repo (which can be indirectly done by setting status.submodulesummary = true), it currently emits an error message (via "git diff-index") since HEAD points to an unborn branch. This patch adds handling of the HEAD-points-to-unborn-branch special case, so that "git submodule summary" no longer emits this error message. The patch also adds a test case that verifies the fix. Suggested-by: Jeff King <peff@peff.net> Signed-off-by: Johan Herland <johan@herland.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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