[api] Add api for creating empty file
[api] Add api for creating empty file

cloudcopy/seahub,miurahr/seahub,madflow/seahub,Chilledheart/seahub,miurahr/seahub,Chilledheart/seahub,miurahr/seahub,cloudcopy/seahub,Chilledheart/seahub,madflow/seahub,miurahr/seahub,cloudcopy/seahub,Chilledheart/seahub,cloudcopy/seahub,Chilledheart/seahub,madflow/seahub,madflow/seahub,madflow/seahub