e754d6efe7810f5f2c6cbd48dca21f1bc84a6a5e

New branches must have a name. An empty one is not a valid ref, but the generic message "We do not like '' as a branch name." is just too vague or difficult to read. So detect the missing name early and tell the user it must be entered. Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
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