submodule--helper update-clone: abort gracefully on missing .gitmodules
When there is no .gitmodules file availabe to initialize a submodule from, `submodule_from_path` just returns NULL. We need to check for that and abort gracefully. When `git submodule update` was implemented in shell, this error out with the warning Submodule path '%s' not initialized Maybe you want to use 'update --init'? Replicate that behavior for now instead of crashing. Signed-off-by: NStefan Beller <sbeller@google.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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