Pandas tz_localize issue within DatetimeTZBlock

Using the .where operation on a localized DataFrame Column may raise an exception due to a failure to tz_localize the result of the operation in DatetimeTZBlock

Code Sample, a copy-pastable example if possible

import pandas
import pytz

TZ = pytz.timezone("Europe/Brussels")
# TZ = None  # <== with TZ = None, there is no exception
d = datetime(2012, 3, 24, 16, tzinfo=TZ)
# d = pytz.timezone(TZ).localize(d)

idx = pandas.date_range("2012/03/24", "2012/03/26", tz=TZ, freq='H')
df = pandas.Series(None, index=idx, name="d").to_frame()
df["d"] = idx
print("following line is OK")
df["d"].where(df["d"] > d, d)

df["d"] = idx[::-1]   # tz_localize will fail 
print("following line raises exception")
df["d"].where(df["d"] > d, d)

Actual Output

following line is OK
following line raises exception
==> raises exception "pytz.exceptions.NonExistentTimeError: 2012-03-25 02:00:00"  / "TypeError: Could not operate [1332607320000000000] with block values [2012-03-25 02:00:00]"

Expected Output

following line is OK
following line raises exception
[no exception raised]

output of pd.show_versions()

INSTALLED VERSIONS

commit: None python: 3.5.2.final.0 python-bits: 32 OS: Windows OS-release: 7 machine: AMD64 processor: Intel64 Family 6 Model 61 Stepping 4, GenuineIntel byteorder: little LC_ALL: None LANG: None

pandas: 0.18.1 nose: None pip: 8.1.2 setuptools: 23.0.0 Cython: None numpy: 1.11.0 scipy: 0.17.1 statsmodels: None xarray: None IPython: 4.2.0 sphinx: None patsy: None dateutil: 2.5.3 pytz: 2016.4 blosc: None bottleneck: None tables: None numexpr: 2.6.1 matplotlib: 1.5.1 openpyxl: 2.3.2 xlrd: 1.0.0 xlwt: None xlsxwriter: 0.9.2 lxml: 3.6.0 bs4: None html5lib: None httplib2: 0.9.2 apiclient: None sqlalchemy: 1.0.12 pymysql: None psycopg2: 2.6.2 (dt dec pq3 ext) jinja2: 2.8 boto: None pandas_datareader: None

Comment From: jreback

Out[3]:
2012-03-24 00:00:00+01:00   2012-03-26 00:00:00+02:00
2012-03-24 01:00:00+01:00   2012-03-25 23:00:00+02:00
2012-03-24 02:00:00+01:00   2012-03-25 22:00:00+02:00
2012-03-24 03:00:00+01:00   2012-03-25 21:00:00+02:00
2012-03-24 04:00:00+01:00   2012-03-25 20:00:00+02:00
2012-03-24 05:00:00+01:00   2012-03-25 19:00:00+02:00
                                       ...
2012-03-25 19:00:00+02:00   2012-03-24 16:42:00+01:00
2012-03-25 20:00:00+02:00   2012-03-24 16:42:00+01:00
2012-03-25 21:00:00+02:00   2012-03-24 16:42:00+01:00
2012-03-25 22:00:00+02:00   2012-03-24 16:42:00+01:00
2012-03-25 23:00:00+02:00   2012-03-24 16:42:00+01:00
2012-03-26 00:00:00+02:00   2012-03-24 16:42:00+01:00
Freq: H, Name: d, dtype: datetime64[ns, Europe/Brussels]

I think fixed by #13583 (though several PR's did touch upon this).