FlxSpriteGroup: if you turn out outlines in the debugger, drawDebug() fails on a null check because _point and _rect do not exist and are assumed to exist in FlxObject.drawDebug().
The overriden initVars() function in FlxSpriteGroup implies that these were excluded because they are not otherwise used, so I added a compiler conditional that only adds them if the debugger overlay is available.
Merge pull request #1250 from larsiusprime/fixbug_flxspritegroup_drawdebug

FlxSpriteGroup: if you turn out outlines in the debugger, drawDebug() fa...