The ornamental design for a productdisplay, as shown and described.
FIG. 1 a perspective view of a product display embodying our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a left view thereof; and,
FIG. 4 is a back view thereof.
The broken lines showing portions of the product display are included for the purpose of illustrating environmental structure and form no part of the claimed design. Certain features currently not in broken lines may be placed into broken lines in other embodiments while other features in broken lines may be placed in solid lines in other embodiments.