fix last line is incomplete

[zlpqingmei]

No description provided.

[coveralls]

Coverage decreased (-0.2%) to 56.718% when pulling 4db6e9d on zlpqingmei:master into 203e7f0 on smartbgp:master.

[coveralls]

Coverage decreased (-0.2%) to 56.718% when pulling 4db6e9d on zlpqingmei:master into 203e7f0 on smartbgp:master.

[xiaopeng163]

@meidli

[xiaopeng163]

Basically, you use try-except to get the last real seq(if last line is complete) or the seq before last line(if last line is incomplete) as last seq.

how about if catch an exception, and we know exactly that exception is caused by last line incomplete, we return the last seq as last seq + 1.

{seq: 2}
{se.....}  # incomplete

and we return last seq = 3, because the next line should be started from seq =4

how do you think @meidli