As the formula creator, you can handle component indicators that have null scores.
First set the formula indicator to calculate the formula even when it contains a null
score.
Role required: pa_power_user, admin
The formulas in
formula indicators typically contain one or more other indicators. If one of those
indicators has no score, by default the formula is not calculated and the formula
indicator returns no score. However, several use cases exist for identifying the
indicator that has no score instead of having the formula indicator return null.
First enable the formula to be calculated when an indicator in the formula has no
score. Then you can assign a value to an indicator with no score.

Open the formula indicator of interest.

Select Allow formula component to be null.

In the Formula, add an
if{} else {}
statement that ascribes a value to an indicator when it has no score.
Example: Field indicator with Allow formula component to be null
Consider the following formula indicators for a collection period when there are no
closed incidents, so the indicator Number of closed incidents has no score.
Formula
1:
[[Number of open incidents
]] / [[Number of closed incidents]]
Formula 2:
[[Formula 1]] + 23
Formula 3:
if ([[Formula 1]] == null) { 23 } else { 11 }
Formula 4:
[[Formula 2]]  64
Formula
5:
(([[Formula 1]] == null && [[Formula 2]] == null) ? 11 : 18)
If Allow formula component to be null is not selected for any
of the formula indicators, none of them have scores.
If
Allow formula component to be null is selected for all of
the formula indicators, they have the following scores:
Formula 2, Formula 3, Formula 4, and Formula 5 represent four different ways to
handle the null score.