Max recursion limit on pd.eval
#### Code Sample

After some hypothesis testing on our codebase we noticed that pd.eval can cause a max recursion limit when run on an empty dataframe or an all NaN dataframe:

```python
import pandas as pd
df = pd.DataFrame(index=list(range(0,1)), columns=list('abc'))
df.eval('a*b') # Max recursion limit
```

And:

```python
import pandas as pd
df = pd.DataFrame(columns=list('abc'))
df.eval('a*b') # Max recursion limit
```

Interestingly enough using numpy.nan works correctly so the error is caused if the data is native python nan:

```python
import pandas as pd
import numpy as np
df = pd.DataFrame(index=list(range(0,1)), columns=list('abc'), data=np.nan)
df.eval('a*b')
```

This seems to happen on 0.19.2 so I don't think this is a regression. 
A similar issue was raised in 2013 #5198 

INSTALLED VERSIONS
<details>

------------------
commit           : None
python           : 3.6.5.final.0
python-bits      : 64
OS               : Windows
OS-release       : 7
machine          : AMD64
processor        : Intel64 Family 6 Model 60 Stepping 3, GenuineIntel
byteorder        : little
LC_ALL           : None
LANG             : None
LOCALE           : None.None
pandas           : 0.25.0
numpy            : 1.16.4
pytz             : 2018.4
dateutil         : 2.7.3
pip              : 10.0.1
setuptools       : 39.1.0
Cython           : None
pytest           : 3.5.1
hypothesis       : None
sphinx           : 1.8.2
blosc            : None
feather          : None
xlsxwriter       : 1.0.4
lxml.etree       : 4.1.1
html5lib         : 1.0.1
pymysql          : None
psycopg2         : None
jinja2           : 2.10
IPython          : 6.4.0
pandas_datareader: None
bs4              : 4.7.1
bottleneck       : None
fastparquet      : None
gcsfs            : None
lxml.etree       : 4.1.1
matplotlib       : 2.2.2
numexpr          : 2.6.5
odfpy            : None
openpyxl         : None
pandas_gbq       : None
pyarrow          : None
pytables         : None
s3fs             : None
scipy            : 1.1.0
sqlalchemy       : 1.2.8
tables           : 3.5.2
xarray           : None
xlrd             : 1.1.0
xlwt             : None
xlsxwriter       : 1.0.4

</details>