mailinfo: don't discard names under 3 characters

I sometimes receive patches from people with short mononyms, and in my
cultural environment these are not uncommon. To my dismay, git-am
currently discards their names, and replaces them with their email
addresses.

Link: https://www.kalzumeus.com/2010/06/17/falsehoods-programmers-believe-about-names/
Signed-off-by: edef <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: edef1c

mailinfo.c

@@ -19,7 +19,7 @@ static void cleanup_space(struct strbuf *sb)
 static void get_sane_name(struct strbuf *out, struct strbuf *name, struct strbuf *email)
 {
 	struct strbuf *src = name;
-	if (name->len < 3 || 60 < name->len || strpbrk(name->buf, "@<>"))
+	if (!name->len || 60 < name->len || strpbrk(name->buf, "@<>"))
 		src = email;
 	else if (name == out)
 		return;