Power App- If Text Input box is blank how to save to Sharepoint list on a Patch function

Patch(

SharepointList, ThisItem,

{

Reserved: true, ReservedBy:User().FullName,

ReserverEmail: User().Email,

LearnerFullName: If(IsBlank(tiLearnerName_3.Text), Blank(), tiLearnerName_3.Text),

WhoFilledOutFormText: ddWhoFilling_3.Selected.Value

}

);