Add a special empty tagset attribute in morph
Add a special empty tagset attribute in morph

alpheios-project/arethusa,fbaumgardt/arethusa,latin-language-toolkit/arethusa,fbaumgardt/arethusa,alpheios-project/arethusa,PonteIneptique/arethusa,fbaumgardt/arethusa,alpheios-project/arethusa,Masoumeh/arethusa,PonteIneptique/arethusa,latin-language-toolkit/arethusa,Masoumeh/arethusa