Handle empty password from broader set of MySQL clients #1084
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Some MySQL clients (e.g. libmysql) send a single null byte to indicate an empty password, while others (e.g. mariadb) send an empty packet. This matches MySQL server's own handling: ```c if (!pkt_len || (pkt_len == 1 && *pkt == 0)) ``` (Source: https://github.com/mysql/mysql-server/blob/8.0/sql/auth/sha2_password.cc)
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Some MySQL clients (e.g. libmysql) send a single null byte to indicate an empty password, while others (e.g. mariadb) send an empty packet. This matches MySQL server's own handling:
(Source: https://github.com/mysql/mysql-server/blob/8.0/sql/auth/sha2_password.cc)