Testing: Failing tests on py36-pandas-dev

[jhamman]

We currently have 7 failing tests when run against the pandas development code (travis).

Question for @shoyer - can you take a look at these and see if we should try to get a fix in place prior to v.0.10.0? It looks like Pandas.0.21 is slated for release on Sept. 30.

[shoyer]

It looks like two issues here:

• Something related to resample DataArray.to_series() creates a MultiIndex even for 1D data DataArray.to_series() creates a MultiIndex even for 1D data #1548
• Something related to isnull/isna Fix errors with isnull() that appear with pandas 0.21 #1549

I'll start digging when I have time. Let's mark this as a 0.10 blocker for now, until we figure out what's going on. My guess is that these are pandas bugs (but we'll see).

[max-sixty]

potentially (but supposed to be warnings only) pandas-dev/pandas#16972

[shoyer]

Fixes for both of these are up for review in #1548 and #1549.

[jhamman]

closed via #1548 and #1549.