The ornamental design for a portablelight having a flexible stalk, substantially as shown and described.
FIG. 1 is a perspective view of an ornamental design for a portable light having a flexible stalk, wherein the flexible stalk is shown in an example position;
FIG. 2 is a second perspective view thereof, wherein the flexible stalk is shown in a second example position;
FIG. 3 is a side view of a first side thereof;
FIG. 4 is a side view of a second side thereof;
FIG. 5 is a side view of a third side thereof;
FIG. 6 is a side view of a fourth side thereof;
FIG. 7 is an end view of a first end thereof; and,
FIG. 8 is an end view of a second end thereof.
Broken lines in the Drawing indicate unclaimed parts of the article that are not claimed herein, and that form no part of the claimed design. The part of the portable light between the break lines in the stalk is not claimed herein and forms no part of the claimed design.