Fixed missing data labels when adding and removing plot data. Fixed issue #293.
Fixed missing data labels when adding and removing plot data. Fixed issue #293.

core-plot/core-plot,core-plot/core-plot,shinjukunian/core-plot,Akylas/core-plot,Akylas/core-plot,shinjukunian/core-plot,Akylas/core-plot,core-plot/core-plot,shinjukunian/core-plot,Akylas/core-plot,Akylas/core-plot,core-plot/core-plot,shinjukunian/core-plot,shinjukunian/core-plot