[BUG] missing days with zero count in linechart and barchart

[sogo-on-github]

Describe the bug unfortunately there is a missing option (!?) for displaying also days with a count of zero... currently they are just skipped in linechart and barchart

To Reproduce Steps to reproduce the behavior: create a line chart with "day" and days with count of zero Expected behavior show the line getting to zero or an empty bar but with no gap in the days on xaxis

Screenshots