Error / warning when activated through API / CLI

When installing / activating the plugin in WordPress.com (https://wordpress.com/plugins/wp-dummy-content-generator), there is an error returned to the user. This is due to a redirection happening on plugin_activated in https://plugins.trac.www.ads-software.com/browser/wp-dummy-content-generator/trunk/wp_dummy_content_generator.php#L80.

When in API ( wp-json, xmlrpc etc) or WP CLI context, the redirection would return an error or warning instead of success message.