Empty passwords don't work

[gar1t]

The fix is to just add a new function header to mysql_auth:password_new:

• password_new([], _Salt) ->

• <<>>;
  

  password_new(Password, Salt) ->
  Stage1 = crypto:sha(Password),

[gar1t]

Sorry, codeblock is:

+ password_new([], _Salt) ->
+     <<>>;
  password_new(Password, Salt) ->
      Stage1 = crypto:sha(Password),

[weisslj]

I believe this issue can be closed because of commit ee39d40.