Error when using py2exe & pandas 0.8.1
When compiling pandas 2 errors prevent the compiled installer from running:

In pandas.core.format (line 155) an unitintialised doc string is used:

**doc** += docstring_to_string

Easy solution:

if **doc**:
    **doc** += docstring_to_string
else:
    **doc** = docstring_to_string

In pandas.utils.decorators.py line 98:

docitems = [func.**doc** if func.**doc** else '', self.addendum]
        func.**doc** = ''.join(docitems)
        return func

becomes:

def **call**(self, func):  
        docitems = [func.**doc** if func.**doc** else '', self.addendum if self.addendum else '']
        func.**doc** = ''.join(docitems)
        return func
