The ornamental design for a bracket for christmastreetrack, as shown and described.
FIG. 1 is a perspective view of a bracket for Christmas tree track showing my new design;
FIG. 2 is a front elevational view thereof
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines shown in drawings are for the purpose of illustrating portions of the bracket for Christmas tree track and form no part of the claimed design.