test for null marker passed in to _getInfowWindowTemplate
test for null marker passed in to _getInfowWindowTemplate

dapriett/nativescript-google-maps-sdk,dapriett/nativescript-google-maps-sdk,dapriett/nativescript-google-maps-sdk,dapriett/nativescript-google-maps-sdk,dapriett/nativescript-google-maps-sdk