Other: Map Value action - when the result is a single value, do not return an array, just return the value.
This allows other actions which only accept a single value, to use the result of the Other: Map Value action as an input.
For example, when setting the payment instrument on a Contribution. Without this change the following error is thrown:
"error_message": "Action Create Contribution failed. Caused by payment_instrument requires a single value a multiple value is given"
This is a similar approach to !91 (merged)
Agileware Ref: CVAP-28