Remove alternative text if there are none

Julien LepillerSun Jul 18 19:26:41+0200 2021

86470b7

nani/app/furiganatextview/src/main/res/values
namelast commitdate
attrs.xmlAdd furiganaMon Apr 15 20:09:48+0200 2019
strings.xmlAdd furiganaMon Apr 15 20:09:48+0200 2019