get blocks error

[chinwei1989]

Version of Python you are running

3.6

Version of steem-python you are running

steem==1.0.2

Expected Behavior

UnboundLocalError: local variable 'error' referenced before assignment

Actual Behavior

no error

Steps to reproduce

blockchain = Blockchain(steem_instance = steemInstance )

Stack Trace

UnboundLocalError: local variable 'error' referenced before assignment
exception with_traceback <built-in method with_traceback of BlockDoesNotExistsException object at 0x110ecc168>