Time series is not in continuous line

I am using a dynatrace api to retrieve data, so i grouped it into a matrix like below

so i can display it in time series but its not in continuous line, tried in transformation to replace empty and also in value mappings, but not working. How to replace null or empty as 0.

if you really want just 0’s, use an add field from calculation transformation, choose binary operation, and multiply it by 0.

Thanks for the reply yes that works if we want only 0s in empty cells.
I am displaying it in time series, so it is not connected in continuous way.

And i saw this option called connect null values so, this solves the issue, for this we have to select lines as style.

Now it looks like this.