branch: don't assume the merge filter ref exists
print_ref_list looks up the merge_filter_ref and assumes that a valid pointer is returned. When the object doesn't exist, it tries to dereference a NULL pointer. This can be the case when git branch --merged is given an argument that isn't a valid commit name. Check whether the lookup returns a NULL pointer and die with an error if it does. Add a test, while we're at it. Signed-off-by: NCarlos Martín Nieto <cmn@elego.de> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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