Line chart missing lines

[Avi]

Hi,

I have this requirement of line chart with lines and markers, am able to plot the markers and lines but the lines are missing between few markers as some data is not there for few months.
For example, jan, feb, mar and april are supposed to have continuous markers and lines but when mar does not have any value then the line will appear only between Jan and Feb,  April will appear as a marker.
please let me know how to show zero  for empty months so the line will be continuous
please refer the attached image.
kindly help.


Regards