issue moving from 3.4.0 to latest

  Hi everyone,


  I'm upgrading reportlab from 3.4.0 to 3.5.x issue with _do_post_text()

I'm upgrading reportlab from 3.4.0 to 3.5.x and there is a change in 
paragraph.py -> _do_post_text(). In that method there is a line of code:

lw = _isConv(w,values,default=tx._defaultLineWidth)

which is returning a string of zero length ('') and not a number. I can 
fix the issue by changing the lw value to 0 (zero).

But I wonder where I should be looking for the root of the issue???? Is 
it in my rxml file. The file print fine with reportlab 3.4.0.


Johnf