"null" as a value can't be used for certain statements

[Paril]

Seems that, somewhere down the line, "toString" is called on all of the arguments of prepared statements, which can't be run on the value of null since it's.. well, null.

TypeError: Cannot read property 'toString' of undefined
    at Execute.toPacket (/home/planetmi/chat/node/js/node_modules/mysql2/lib/packets/execute.js:47:39)
    at Execute.start (/home/planetmi/chat/node/js/node_modules/mysql2/lib/commands/execute.js:50:40)
    at Execute.Command.execute (/home/planetmi/chat/node/js/node_modules/mysql2/lib/commands/command.js:39:20)

[sidorares]

this was started in #480 but unfortunately did not have time yet to review & merge

also related are #493, #353

[testn]

@sidorares I guess that this has been addressed?

[sidorares]

I believe this has been addressed, yes