fix: float division by zero

[rohitwaghchaure]

Issue

  File "apps/frappe/frappe/model/document.py", line 1300, in composer
    return composed(self, method, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/model/document.py", line 1282, in runner
    add_to_return_value(self, fn(self, *args, **kwargs))
                              ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/model/document.py", line 937, in fn
    return method_object(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "apps/erpnext/erpnext/subcontracting/doctype/subcontracting_receipt/subcontracting_receipt.py", line 153, in on_submit
    self.update_stock_ledger()
  File "apps/erpnext/erpnext/controllers/subcontracting_controller.py", line 865, in update_stock_ledger
    self.make_sl_entries(
  File "apps/erpnext/erpnext/controllers/stock_controller.py", line 645, in make_sl_entries
    make_sl_entries(sl_entries, allow_negative_stock, via_landed_cost_voucher)
  File "apps/erpnext/erpnext/stock/stock_ledger.py", line 107, in make_sl_entries
    repost_current_voucher(args, allow_negative_stock, via_landed_cost_voucher)
  File "apps/erpnext/erpnext/stock/stock_ledger.py", line 123, in repost_current_voucher
    update_entries_after(
  File "apps/erpnext/erpnext/stock/stock_ledger.py", line 545, in __init__
    self.build()
  File "apps/erpnext/erpnext/stock/stock_ledger.py", line 593, in build
    self.process_sle_against_current_timestamp()
  File "apps/erpnext/erpnext/stock/stock_ledger.py", line 616, in process_sle_against_current_timestamp
    self.process_sle(sle)
  File "apps/erpnext/erpnext/stock/stock_ledger.py", line 747, in process_sle
    self.calculate_valuation_for_serial_batch_bundle(sle)
  File "apps/erpnext/erpnext/stock/stock_ledger.py", line 903, in calculate_valuation_for_serial_batch_bundle
    self.wh_data.valuation_rate = flt(self.wh_data.stock_value, precision) / flt(
                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ZeroDivisionError: float division by zero