The ornamental design for a productdispenser, as shown and described.
FIG. 1 is a perspective view of a product dispenser showing my new design;
FIG. 2 is a perspective view thereof with the cover in an open position;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The broken line showing of the product dispenser in FIGS. 1 and 2 is included for the purpose of illustrating environment and forms no part of the claimed design.