Prevent fatal error if parent plugin is deleted without activating

[oakesjosh]

If the parent plugin is installed, but not activated, stellarwp_telemetry is not set. When deleting the plugin, the default value of false is passed to the count() function which will throw a warning on php 7.2+ and fatal error on 8.0+.

Steps to recreate

• Install Kadence Blocks (3.1.*) on a site without a stellarwp_telemetry entry in options table
• Do not activate plugin
• Attempt to delete plugin via wp-admin