check the result of find() before reading t_warehouse off it. on a
'receive from customer' entry with no row carrying scio_detail, find()
returns undefined and items_add throws a typeerror.
the throw rejects the serially-run handler chain, so the stock entry
controller's own items_add never runs and the new row silently loses
its target warehouse, expense account, cost center and serial/batch
field defaults.
leave t_warehouse unset when no reference row exists, so the rest of
the chain still runs.
(cherry picked from commit 6e444a1832)
# Conflicts:
# erpnext/stock/doctype/stock_entry/stock_entry.js
adbc67ef11