marination 1eb3ca2b86 fix: (travis) Production Plan Summary Report breaks if no WO
- `get_cached_value` throws a DoesNotExistError if non-existent value, used `get_value` instead
- accomodate production plan items that dont have WO/PO against them as well (blank values)
- added some None value handling to avoid AttributeError
2021-11-09 23:07:28 +05:30
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