github.com/go-sql-driver/mysql auth update leads to panic

[zwpaper]

issue checked, no dup found.

What version of Go are you using (go version)?

go version go1.8 linux/amd64

Which database and its version are you using?

mysql 5.1.73

Please provide a complete runnable program to reproduce your issue. IMPORTANT

get the newest version of github.com/go-sql-driver/mysql
connect to mysql server

before go-sql-driver/mysql#807, it will panic
after the PR, will show up

[mysql] 2018/05/30 14:36:31 auth.go:191: unknown auth plugin:
[mysql] 2018/05/30 14:36:31 driver.go:120: could not use requested auth plugin '': this authentication plugin is not supported

It seems work normally, but I do not know whether there will be problems using like this...

[nodew]

go-sql-driver/mysql#828

[zwpaper]

this is the driver's issue, further information can look into go-sql-driver/mysql#815, I'm closing this issue.