Null check added to TradeSkillPrerequisite #86
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Description
Please describe what functionality this pull request adds.
In order to solve null reference error null check is added.
Addresses
If this pull request fixes a bug, please link the issue for that bug here.
#83
Testing Completed
What testing was completed to ensure this pull request does not break anything?
I didn't make any structural or behavioral change with adding a null check.