Grafana Expressions Doesn't Work

• What Grafana version and what operating system are you using?
  V9.2.2
• What are you trying to achieve?
  I Have a Expression Query

($2BAvailability + $2CAvailability) / 2

The expression is simply add the 2 query and then get the average by diving it by 2.

• How are you trying to achieve it?
  Using the expression query in grafana panel.

• What happened?
  When either of the Query $2BAvailability or $2CAvailability has no value, the expression doesn’t work.

• What did you expect to happen?
  If there is no data either of $2BAvailability or $2CAvailability it should still show values, for example if $2BAvailability has no value but the $2CAvailability is 100, then it should equate to (0 + 100) / 2 = 50.

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