Fix intercom registration without userId (#22)
Fix intercom registration without userId (#22)

Fixes callback function when the intercom registration has only user email;
asamiller/react-native-intercom,asamiller/react-native-intercom,DisruptiveLabs/react-native-intercom,DisruptiveLabs/react-native-intercom,tinycreative/react-native-intercom,DisruptiveLabs/react-native-intercom,tinycreative/react-native-intercom,tinycreative/react-native-intercom