fix：empty line break is ignored during parsing

[smiler-rf]

for message: "id:111111\nevent:add\ndata:\ndata:more\n\n"

before:
parse result is:

{
id: "11111",
event: "add",
data: "more"
}

now:
parse result is:

{
id: "11111",
event: "add",
data: "\nmore"
}