chewing_userphrase_add() bug

[zmcx16]

When I new add a word "你(ㄋ一ˇ)", an error has occurred:

it's likely that it didn't add "你(ㄋ一ˇ)" to database, but I closed chewing-editor and re-executed it again, "你(ㄋ一ˇ)" already be added in chewing-editor.

I confuse about this warning message: "chewing_userphrase_add() return null", I guess it's failed to add this phrase, but the result is work.

[david50407]

Duplicated to #91

[zmcx16]

I try to type "一", and the same warning message: "chewing_userphrase_add() return null",and then I pressed "update", "一" didn't be add to database.

but this case, the word "你(ㄋ一ˇ)" will be added to database, I want to know what difference between them.