Allow Program to be created without a session

AY2021S2-CS2103T-T10-1 / tp

https://ay2021s2-cs2103t-t10-1.github.io/tp/

MIT License

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Allow Program to be created without a session #423

Closed kouyk closed 3 years ago

kouyk commented 3 years ago

Sessions are much like tags, a program need not have one. Since it is possible to edit a program to delete all of its sessions, add should be able to achieve the same. Both code and UG are updated to reflect this.