ImportError: cannot import name 'isna'

[rozetko]

Steps to reproduce:

• clone repo
• go to analytics/
• pip3 install -r requirements.txt
• python3 server.py

You would see error:

Traceback (most recent call last):
  File "server.py", line 7, in <module>
    from worker import Worker
  File "/mnt/c/Users/rozetko/git/hastic-server/analytics/worker.py", line 2, in <module>
    from anomaly_model import AnomalyModel
  File "/mnt/c/Users/rozetko/git/hastic-server/analytics/anomaly_model.py", line 2, in <module>
    from data_provider import DataProvider
  File "/mnt/c/Users/rozetko/git/hastic-server/analytics/data_provider.py", line 1, in <module>
    import pandas as pd
  File "/home/rozetko/.local/lib/python3.5/site-packages/pandas/__init__.py", line 42, in <module>
    from pandas.core.api import *
  File "/home/rozetko/.local/lib/python3.5/site-packages/pandas/core/api.py", line 10, in <module>
    from pandas.core.groupby import Grouper
  File "/home/rozetko/.local/lib/python3.5/site-packages/pandas/core/groupby/__init__.py", line 2, in <module>
    from pandas.core.groupby.groupby import (
  File "/home/rozetko/.local/lib/python3.5/site-packages/pandas/core/groupby/groupby.py", line 42, in <module>
    from pandas.core.dtypes.missing import isna, isnull, notna, _maybe_fill
ImportError: cannot import name 'isna'

[rozetko]

The problem is that pandas-datareader is missing
More info: https://stackoverflow.com/q/43809620