sample_recognize_receipts.py should have a check before print items in receipt

[squassina]

• Package Name: sample_recognize_receipts.py and sample_recognize_receipts_from_url.py
• Package Version: Current
• Operating System: Any
• Python Version: 3.9

Describe the bug
If the receipt is not itemized an error is display in the sample

To Reproduce
Steps to reproduce the behavior:

1. have a receipt without items
2. run python sample_recognize_receipts.py on that receipt

Expected behavior
The program should complete successfully even without items.

Screenshots

This is the output of a run of the sample in one document I have:

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-21-84af238b6b50> in <module>
----> 1 PrintReceipt(receipt_lst[6])

<ipython-input-20-09663b52ec70> in PrintReceipt(receipts)
     13         print("Receipt items:")
     14 #        if receipt.fields.get("Items"):
---> 15         for idx, item in enumerate(receipt.fields.get("Items").value):
     16             print("...Item #{}".format(idx+1))
     17             item_name = item.value.get("Name")

AttributeError: 'NoneType' object has no attribute 'value'

Additional context
None.

[kristapratico]

@squassina thanks for bringing to our attention! The sample will be fixed asap.

[squassina]

I'm opening the PR for this!

[kristapratico]

@squassina got it - thank you for your contribution! Feel free to tag me on the PR for review. :)

[squassina]

PR opened here: #19342