Fix: Crash when permission is requested by other plugin
Fix: Crash when permission is requested by other plugin

When another plugin(or user code) requests a permission - the `activityRequestPermissionsEvent` event is fired. However, because the permission was not requested by the `nativescript-permissions` plugin there is no track of the request inside the `pendingPromises`. 
This code change prevents the the `Cannot call property "granted" of undefined" in that case`.
NathanaelA/nativescript-permissions