[Laszlo-dev] Integration proposal for 4.0.1

[Philip Romanik]

Change 4922-4923 (LzDatapointer.lzx) fixes an infinite loop problem when 
empty datasets are used for a tree component.

Risk: low. Very few callers use the modified method. The method returns '0' 
instead of 'undefined'.
Reward: Fixes infinite loop in dhtml and swf.