Fix an issue where null values were causing an error in automation loops

[PClmnt]

Description

Null or undefined values were causing an issue in the loop binding replacement code and throwing an error. This fix simply does nothing for those values, (since they're empty and wont contain and handlebars statements that need updated).

Also added some tests to cover this issue and potential other problem areas such as empty arrays / objects.

Addresses

https://linear.app/budibase/issue/BUDI-8410/looping-in-automations-cannot-convert-undefined-or-null-to-object

Launchcontrol

• Fixes an issue where looping an object or array with null values was causing undefined errors

[linear[bot]]

BUDI-8410 Looping in Automations - "Cannot convert undefined or null to object"