The ornamental design for a handle for a kitchenappliance door, as shown and described.
1. Handle for a kitchen appliance door
1.1 : Top left perspective view
1.2 : Top right perspective view
1.3 : Bottom right perspective view
1.4 : Front
1.5 : Right side view
1.6 : Left side view
1.7 : Bottom
The broken lines shown on the handle illustrates portions of the handle that form no part of the claimed design; the dashed lines arround the handle are for environmental purposes only and form no part of the claimed design.