fix: error while saves a document Production Plan List indexoutofrange

[viralkansodiya]

fixes: #36692

[codecov]

Codecov Report

Merging #36771 (b63e4d0) into develop (758ea7b) will decrease coverage by 0.02%.
Report is 8 commits behind head on develop.
The diff coverage is 100.00%.

❗ Current head b63e4d0 differs from pull request most recent head 33e5260. Consider uploading reports for the commit 33e5260 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #36771      +/-   ##
===========================================
- Coverage    65.19%   65.18%   -0.02%     
===========================================
  Files          792      792              
  Lines        61857    61805      -52     
===========================================
- Hits         40330    40289      -41     
+ Misses       21527    21516      -11     

Files Changed	Coverage Δ
...cturing/doctype/production_plan/production_plan.py	80.26% <100.00%> (ø)

... and 8 files with indirect coverage changes