DOM parser fails for comment after root

[Phrogz]

local SLAXML = require 'slaxdom'
SLAXML:dom[[<r/><!-- oops -->]]

--> .\slaxdom.lua:40: attempt to index a nil value (upvalue 'current')
--> stack traceback:
-->         .\slaxdom.lua:40: in field 'comment'
-->         .\slaxml.lua:104: in local 'findComment'
-->         .\slaxml.lua:236: in function 'slaxml.parse'
-->         .\slaxdom.lua:46: in function 'slaxml.dom'
-->         (...tail calls...)
-->         [C]: in ?

[Phrogz]

Oops; would have failed for PIs and text nodes after the root element, as well. Wasn't initializing the parse stack to include the document at first, so after popping the root element there was no current node.