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[#725] XmlAdaptedPerson#toModelType(): Enforce checking of required parameters (#806)

XmlAdaptedPerson#toModelType() does not have a non-null check for each
parameter in person before the isValid*(String).

When null value is passed into the parameter's isValid*(String) check,
a NullPointerException is thrown, causing the app to crash.

Let's update XmlAdaptedPerson#toModelType() to have a separate non-null
check for each parameter before passing them into the isValid*(String)
check.

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