Unable to add s/o into a vendor's name

[leroychiu20]

Bug description: Though the user guide does say that a vendor is usually a company, a vendor could be a person too. In that case, suppose his name is Adam s/o John, i tried to enter that as the vendor's name when creating a new vendor contact.

Steps to reproduce:

1. enter create v/ n/Adam s/o John p/98765432 d/Pastries and cakes, bake in a day t/pastry t/fast into the command box

Expected: Successfully adds the contact to the list of vendors

Actual: Throws an error message, not allowing for the creation of the vendor.

Screenshots:

[nus-se-bot]

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