Resampled.ffill leaves NA
#### Code Sample, a copy-pastable example if possible

```python
# Your code here
x = pandas.Series([1, pandas.np.NaN, 1], index=[pandas.Timestamp('2003-01-01'), pandas.Timestamp('2003-04-16'), pandas.Timestamp('2003-04-17')])

x.resample('D', closed='right').ffill()['2003-04']
```
#### Problem description

Resample.ffill leaves an NA. 

The output of the above has an NA on 2003-04-16 whereas I'd expect it all to be 1.0

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#### Expected Output
2003-04-01    1.0

2003-04-02    1.0

2003-04-03    1.0

2003-04-04    1.0

2003-04-05    1.0

2003-04-06    1.0

2003-04-07    1.0

2003-04-08    1.0

2003-04-09    1.0

2003-04-10    1.0

2003-04-11    1.0

2003-04-12    1.0

2003-04-13    1.0

2003-04-14    1.0

2003-04-15    1.0

2003-04-16    1.0

2003-04-17    1.0

Freq: D, dtype: float64
#### Output of ``pd.show_versions()``

<details>

INSTALLED VERSIONS

------------------

commit           : None

python           : 3.8.0.final.0

python-bits      : 64

OS               : Linux

OS-release       : 3.10.0-862.14.4.el7.x86_64

machine          : x86_64

processor        : x86_64

byteorder        : little

LC_ALL           : None

LANG             : en_US.UTF-8

LOCALE           : en_US.UTF-8

 

pandas           : 0.25.3

numpy            : 1.17.4

pytz             : 2019.3

dateutil         : 2.8.1

pip              : 19.3.1

setuptools       : 42.0.2.post20191203

Cython           : None

pytest           : None

hypothesis       : None

sphinx           : None

blosc            : None

feather          : None

xlsxwriter       : None

lxml.etree       : None

html5lib         : None

pymysql          : None

psycopg2         : None

jinja2           : None

IPython          : None

pandas_datareader: None

bs4              : None

bottleneck       : None

fastparquet      : None

gcsfs            : None

lxml.etree       : None

matplotlib       : None

numexpr          : None

odfpy            : None

openpyxl         : None

pandas_gbq       : None

pyarrow          : None

pytables         : None

s3fs             : None

scipy            : None

sqlalchemy       : None

tables           : None

xarray           : None

xlrd             : None

xlwt             : None

xlsxwriter       : None

</details>
