TST: wb test failing
xref #8551

cc @jnmclarty 

```
.SS.E
======================================================================
ERROR: test_wdi_search (pandas.io.tests.test_wb.TestWB)
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Traceback (most recent call last):
  File "/Users/jreback/pandas/pandas/util/testing.py", line 1417, in wrapper
    return t(*args, **kwargs)
  File "/Users/jreback/pandas/pandas/io/tests/test_wb.py", line 25, in test_wdi_search
    result = search('gdp.*capita.*constant').loc[6716:,['id','name']]
  File "/Users/jreback/pandas/pandas/core/indexing.py", line 1200, in __getitem__
    return self._getitem_tuple(key)
  File "/Users/jreback/pandas/pandas/core/indexing.py", line 704, in _getitem_tuple
    self._has_valid_tuple(tup)
  File "/Users/jreback/pandas/pandas/core/indexing.py", line 131, in _has_valid_tuple
    if not self._has_valid_type(k, i):
  File "/Users/jreback/pandas/pandas/core/indexing.py", line 1260, in _has_valid_type
    (key.start, self.obj._get_axis_name(axis))
KeyError: 'start bound [6716] is not the [index]'

----------------------------------------------------------------------
Ran 5 tests in 14.969s
```
