[Bug] Game crashes when a null object is attempted to be logged with FlixelLogger

[stringdotjar]

Bug Description

When info(), warn(), and error() attempt to log a null object in FlixelLogger, it crashes the game. This is because since any log method can take a generic object, it naturally calls toString() on it.

Steps to Reproduce

Simply use Flixel.info(null), Flixel.warn(null) or Flixel.error(null).

Expected Behavior

It should prevent it and instead just print null in the console.

Logs or Screenshots

FlixelGDX Version

1.0.0

Platform

Other (please specify in description)