Hide the "null" value when the WUI user choose no translation, fix #101 
Hide the "null" value when the WUI user choose no translation, fix #101 

Former-commit-id: 8c424dd76af2afb605c2d12850f18552cb755180
muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous