The ornamental design for a leg-less nightstand, as shown and described.
FIG. 1 is a perspective view of a leg-less nightstand showing my new design;
FIG. 2 is a slightly reduced right elevational view thereof;
FIG. 3 is a slightly reduced left elevational view thereof;
FIG. 4 is a slightly reduced top view thereof;
FIG. 5 is a slightly reduced bottom view thereof;
FIG. 6 is a slightly reduced rear elevational view thereof;
FIG. 7 is a slightly reduced front elevational view thereof; and,
FIG. 8 is a perspective view of the leg-less nightstand installed on a bed; the broken lines showing a bed and articles to be supported is for illustrative purposes only and forms no part of the claimed design.