Empty string behavior

[sp1tz]

Any "attribute" of empty string is evaluated as empty string.

''.length; // ''; should be 0
''.foo; // ''; should be error
''.bar; // ''; should be error

[mminea]

This has just been brought up again by a student. Not sure how hard it is to fix.

[mminea]

A student just stumbled again over this bug. If it is not too hard to fix, it would be useful to avoid confusion.