Description

If null values are present on DB, they are ignored by plotlyjs (no column/data for it rendered) but used for calculating the chart height, for instance, of the chart.

With this improvement, we need to handle the null values as a normal field and make them appear. They can be filtered anyway out.

These null values must be configurable as placeholders, optionally, in the UI

What kind of improvement you want to add? (check one with "x", remove the others)

• Minor changes to existing features
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

Other useful information