'Nonetype' object is not subscriptable error

[jtault]

Occasionally (every 10-20 votes or so) my bot fails with this error:

Traceback (most recent call last):
File "./votingbot.py", line 113, in
for c in steem.stream_comments():
File "/home/.local/lib/python3.4/site-packages/piston/steem.py", line 976, in stream_comments
for c in self.rpc.stream("comment", _args, *_kwargs):
File "/usr/local/lib/python3.4/dist-packages/steemapi/steemnoderpc.py", line 143, in stream
for block in self.block_stream(_args, *_kwargs):
File "/usr/local/lib/python3.4/dist-packages/steemapi/steemnoderpc.py", line 109, in block_stream
head_block = props['last_irreversible_block_num']
TypeError: 'NoneType' object is not subscriptable

[xeroc]

This is weird .. the props variable should have been filled from the API node ..
I guess this is rather a connectivity issuer ..

[jtault]

It seems that my bot is able to handle lost connections successfully, so I'm not sure that is the problem. I'm not sure if it is related, but I also get these errors occasionally:
Traceback (most recent call last):
File "./votingbot.py", line 113, in
for c in steem.stream_comments():
File "/home/.local/lib/python3.4/site-packages/piston/steem.py", line 977, in stream_comments
yield Post(self, c)
File "/home/.local/lib/python3.4/site-packages/piston/steem.py", line 100, in init
post["_tags"] = meta.get("tags", [])
AttributeError: 'str' object has no attribute 'get'

Also my voting function already catches broadcasting errors like so:
def vote(c, weight):
try:
c.vote(weight, account)
except BroadcastingError as e:
print("Vote failed...")
print(str(e))