[REQUEST]: ADD A KEY CONDITION TO CHECK WHETHER A VARIABLE IS EMPTY OR NOT

This feature request respects the following points:

• This is a feature request, not a question or a configuration issue; Please visit our forum first to troubleshoot with volunteers, before creating a report. The links can be found here.
• This issue is not already reported on GitHub (I've searched it).
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Description of the feature request

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Is your feature request related to a problem

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Describe the solution you'd like

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Describe alternatives you've considered

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Relevant screenshots or videos

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Additional information

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No files, tests, entry points, or implementation details are provided. First clarify what a key condition is expected to check, how empty variables are represented, and the intended behavior; then locate the existing condition implementations and variable handling to define verifiable completion criteria.