fix: Collapse Scrap Items in Job Card

[s-aga-r]

Source/Reference: (FR-ISS-316618)

Screenshots:

Before:

After:

Changes:

https://user-images.githubusercontent.com/63660334/141418305-3f20db83-dcbe-46c1-b6b5-0e07d34d81eb.png

If the Scrap Item table is empty i.e., length == 0 then the scrap_items_section is collapsed by default.

[codecov]

Codecov Report

Merging #28362 (55285fc) into develop (944bf8d) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop   #28362      +/-   ##
===========================================
- Coverage    55.26%   55.20%   -0.06%     
===========================================
  Files         1119     1119              
  Lines        66548    66548              
===========================================
- Hits         36777    36740      -37     
- Misses       29771    29808      +37     

Impacted Files	Coverage Δ
...work_order_stock_report/work_order_stock_report.py	50.00% <0.00%> (-50.00%)	⬇️
...ctype/woocommerce_settings/woocommerce_settings.py	80.00% <0.00%> (-4.00%)	⬇️
...e/asset_value_adjustment/asset_value_adjustment.py	87.65% <0.00%> (-3.71%)	⬇️
...ctype/accounting_dimension/accounting_dimension.py	64.06% <0.00%> (-1.57%)	⬇️
.../hr/doctype/upload_attendance/upload_attendance.py	44.69% <0.00%> (-1.52%)	⬇️
...e/period_closing_voucher/period_closing_voucher.py	88.05% <0.00%> (-1.50%)	⬇️
erpnext/portal/utils.py	28.98% <0.00%> (-1.45%)	⬇️
...eport/production_analytics/production_analytics.py	69.51% <0.00%> (-1.22%)	⬇️
erpnext/stock/stock_ledger.py	85.63% <0.00%> (-0.91%)	⬇️
erpnext/accounts/deferred_revenue.py	75.11% <0.00%> (-0.89%)	⬇️
... and 12 more