Fix NPE when updating tabs before tab views are created
Fix NPE when updating tabs before tab views are created

guyca/react-native-navigation,wix/react-native-navigation,guyca/react-native-navigation,3sidedcube/react-native-navigation,wix/react-native-navigation,wix/react-native-navigation,guyca/react-native-navigation,wix/react-native-navigation,guyca/react-native-navigation,3sidedcube/react-native-navigation,3sidedcube/react-native-navigation,wix/react-native-navigation,wix/react-native-navigation,3sidedcube/react-native-navigation