Scope

Do not send subscription cancel emails to subscriptions with scheduled cancellation

Solution 

This can be done using the Email Segmentation feature in Chargebee.
Navigate to Settings->Configure Chargebee-> Email notifications-> Click on Manage segment-> Create new filter->Select the filter as has scheduled changes as false from the subscriptions tab -> Save the filter (select 'Make this filter accessible to all) so that only subscriptions without scheduled changes will get the Cancellation emails.

Note: Segmentation feature is available only for certain plan. Click here to know more. 

Here’s more information about Email Segmentation.