fix: unsupported operand type(s) for +: 'int' and 'NoneType'

[rohitwaghchaure]

Error

Traceback (most recent call last):
  File "apps/frappe/frappe/app.py", line 69, in application
    response = frappe.api.handle()
  File "apps/frappe/frappe/api.py", line 55, in handle
    return frappe.handler.handle()
  File "apps/frappe/frappe/handler.py", line 38, in handle
    data = execute_cmd(cmd)
  File "apps/frappe/frappe/handler.py", line 76, in execute_cmd
    return frappe.call(method, **frappe.form_dict)
  File "apps/frappe/frappe/__init__.py", line 1457, in call
    return fn(*args, **newargs)
  File "apps/erpnext/erpnext/stock/get_item_details.py", line 91, in get_item_details
    out.update(get_price_list_rate(args, item))
  File "apps/erpnext/erpnext/stock/get_item_details.py", line 792, in get_price_list_rate
    insert_item_price(args)
  File "apps/erpnext/erpnext/stock/get_item_details.py", line 817, in insert_item_price
    if args.get("conversion_factor")
TypeError: unsupported operand type(s) for +: 'int' and 'NoneType'

[codecov]

Codecov Report

Merging #33354 (0f28074) into develop (c5d21b2) will increase coverage by 0.03%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #33354      +/-   ##
===========================================
+ Coverage    63.96%   64.00%   +0.03%     
===========================================
  Files          818      818              
  Lines        58620    58628       +8     
===========================================
+ Hits         37497    37523      +26     
+ Misses       21123    21105      -18     

Impacted Files	Coverage Δ
erpnext/stock/get_item_details.py	80.38% <ø> (ø)
erpnext/controllers/status_updater.py	88.23% <0.00%> (-0.48%)	⬇️
...pnext/accounts/report/gross_profit/gross_profit.py	77.81% <0.00%> (-0.27%)	⬇️
...xt/accounts/doctype/sales_invoice/sales_invoice.py	81.75% <0.00%> (-0.09%)	⬇️
...xt/accounts/doctype/payment_entry/payment_entry.py	72.54% <0.00%> (-0.07%)	⬇️
erpnext/accounts/utils.py	74.24% <0.00%> (+0.03%)	⬆️
erpnext/stock/doctype/serial_no/serial_no.py	89.43% <0.00%> (+0.23%)	⬆️
erpnext/stock/doctype/stock_entry/stock_entry.py	82.23% <0.00%> (+0.78%)	⬆️
...e/payment_reconciliation/payment_reconciliation.py	93.96% <0.00%> (+1.04%)	⬆️
...ext/manufacturing/doctype/work_order/work_order.py	80.99% <0.00%> (+1.38%)	⬆️