fix issue #16284, child table copy (#16285)
fix issue #16284, child table copy (#16285)

* fix issue #16284, child table copy 

V11 Child table from Clipboard Excel error, can't multiply sequence by non-int of type 'float'

* Update get_item_details.py

consider the empty string case

* Update get_item_details.py

gsnbng/erpnext,gsnbng/erpnext,gsnbng/erpnext,gsnbng/erpnext