examples.py broken: NoneType is not iterable

[jmtd]

Assuming I comment out a line to avoid #12 , during the iteration, I eventually get

Traceback (most recent call last):
  File "examples.py", line 23, in <module>
    for subproduct in order.subproducts:
TypeError: 'NoneType' object is not iterable

It seems one of the orders return is empty.

[jmtd]

(I planned to do more debugging here but I hit #11 )