I claim the ornamental design for an electric candle, as shown and described.
FIG. 1 is a top, front, right side perspective view of the electric candle of the new design.
FIG. 2 is a front elevation view of the electric candle of the new design.
FIG. 3 is a rear elevation view of the electric candle of the new design.
FIG. 4 is a left side elevation view of the electric candle of the new design.
FIG. 5 is a right side elevation view of the electric candle of the new design.
FIG. 6 is a top plan view of the electric candle of the new design; and,
FIG. 7 is a bottom plan view of the electric candle of the new design.
The broken lines disclosure in the views represents portions of the electric candle which form no part of the claimed design, and the outer-most circular line on the bottom of the candle represents an unclaimed boundary between claimed and unclaimed surfaces.