The ornamental design for a debristray, as shown and described.
FIG. 1 is a perspective view of the debris tray of my new design.
FIG. 2 is a top plan view thereof.
FIG. 3 is a front elevational view thereof.
The opposite rear view is a mirror image thereof.
FIG. 4 is a side elevational view thereof.
The opposite side view is a mirror image thereof; and,
FIG. 5 is a bottom plan view thereof.
The broken line elements shown in FIG. 1 depicting a continuous belt and a bar code reader adjacent thereto, are environmental, and are not a part of my new design.