add glottal stop, because leaving it blank seems to lead to UNK tokens

vocab.json

@@ -1 +1 @@
-{"\u0251": 1, "\u00e6": 2, "\u028c": 3, "a\u028a": 4, "\u0259": 5, "\u025d": 6, "a\u026a": 7, "b": 8, "\u02a7": 9, "d": 10, "\u00f0": 11, "\u027e": 12, "\u025b": 13, "l\u0329": 14, "m\u0329": 15, "n\u0329": 16, "\u014b\u0329": 17, "\u025a": 18, "e\u026a": 19, "f": 20, "g": 21, " ": 22, "h": 24, "\u026a": 26, "i\u02d0": 27, "\u02a4": 28, "k": 29, "l": 30, "m": 31, "n": 32, "\u014b": 33, "\u027e\u0303": 34, "o\u028a": 35, "\u0254\u026a": 36, "p": 37, "": 38, "\u0279": 39, "s": 40, "\u0283": 41, "t": 42, "\u03b8": 43, "\u028a": 44, "u\u02d0": 45, "v": 46, "w": 47, "j": 48, "z": 49, "\u0292": 50, "|": 0, "[UNK]": 51, "[PAD]": 52}
+{"\u0251": 1, "\u00e6": 2, "\u028c": 3, "a\u028a": 4, "\u0259": 5, "\u025d": 6, "a\u026a": 7, "b": 8, "\u02a7": 9, "d": 10, "\u00f0": 11, "\u027e": 12, "\u025b": 13, "l\u0329": 14, "m\u0329": 15, "n\u0329": 16, "\u014b\u0329": 17, "\u025a": 18, "e\u026a": 19, "f": 20, "g": 21, " ": 22, "h": 24, "\u026a": 26, "i\u02d0": 27, "\u02a4": 28, "k": 29, "l": 30, "m": 31, "n": 32, "\u014b": 33, "\u027e\u0303": 34, "o\u028a": 35, "\u0254\u026a": 36, "p": 37, "ʔ": 38, "\u0279": 39, "s": 40, "\u0283": 41, "t": 42, "\u03b8": 43, "\u028a": 44, "u\u02d0": 45, "v": 46, "w": 47, "j": 48, "z": 49, "\u0292": 50, "|": 0, "[UNK]": 51, "[PAD]": 52}