ERR: read_csv with dtype specified on empty data
File has this content:

```
A,A
3,3
```

When I do `pd.read_csv(filepath)` - all looks fine, however if I specify _skiprows_ and _dtype_ parameters it fails with the following error:

```
pd.read_csv(filepath, skiprows=1, dtype=str)
```

> AttributeError: type object 'str' has no attribute 'items'

---
## INSTALLED VERSIONS

commit: None
python: 2.7.10.final.0
python-bits: 64
OS: Linux
OS-release: 2.6.18-238.9.1.el5
machine: x86_64
processor: x86_64
byteorder: little
LC_ALL: None
LANG: en_US

**pandas: 0.17.1**
