The ornamental design for a glasswareholder, as shown and described.
FIG. 1 is a perspective view of a glassware holder in accordance with the present design, shown with glassware received therein as part of the surrounding environment;
FIG. 2 is a perspective view thereof;
FIG. 3 is a side elevation view thereof, the opposite side being identical thereto;
FIG. 4 is an end view thereof, the opposite end being identical thereto;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
Any parts shown in broken lines form no part of the claimed design.