I claim the ornamental design for a door having a glass window, as shown and described.
FIG. 1 is a front elevation view of a glass window. The broken lines are for illustrative purposes only and form no part of the claimed design; and,
FIG. 2 is a rear elevation view thereof.
The characteristic feature of the design resides in the window being partially or completed surrounded at the edges by colored glass arranged in a Tiffany fashion around the edge of the window with clear glass disposed centrally therewithin.