"'NoneType' object is not iterable" on "Expand all" in BOM Tree

[strixaluco]

Steps to reproduce:

1. go to https://beta.erpnext.com/desk#Tree%2FBOM;
2. choose any BOM;
3. click on Expand all button

Expected result:
BOM tree expands

Actual result:

Traceback (most recent call last):
  File "/home/frappe/frappe-bench/apps/frappe/frappe/app.py", line 55, in application
    response = frappe.handler.handle()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/handler.py", line 19, in handle
    execute_cmd(cmd)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/handler.py", line 36, in execute_cmd
    ret = frappe.call(method, **frappe.form_dict)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/__init__.py", line 888, in call
    return fn(*args, **newargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/desk/treeview.py", line 22, in get_all_nodes
    to_check = [d.value for d in data if d.expandable]
TypeError: 'NoneType' object is not iterable

Environment:
beta.erpnext.com
ERPNext: v7.2.0-beta
Frappe Framework: v7.2.0-beta
Firefox ESR 45.5.1

[rmehta]

@strixaluco please raise this in ERPNext Issues (ok for now)

[strixaluco]

Sorry, I assumed it's related to Frappe because of traceback (eg. File "/home/frappe/frappe-bench/apps/frappe/frappe/app.py")

[rmehta]

No issues. Just easier to track issues on one repo!

[strixaluco]

Got it. To be honest, I always thought better to be specific and open issue in corresponding repo.