Fix: Handle empty quickSightGroupArns

[oussmoh]

This commit adds a condition to evaluate whether the user has QuickSight groups but didn't select any. This condition helps prevent the parameter from being empty when the user fails to select a group.

Issue:

This issue occurs when a user selects a user but fails to select a group. As a consequence, the parameter -c quickSightGroupArns is left empty, leading to failure in the stack.

Description of changes: This commit adds a condition to evaluate whether the user has QuickSight groups but didn't select any

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