Throwing InvalidDimensions when append_col with header is called but only headers exists

Related #33

1 files changed, 6 insertions, 0 deletions

diff --git a/tablib/core.py b/tablib/core.py
index f52ca92..166d18e 100644
--- a/tablib/core.py
+++ b/tablib/core.py
@@ -649,8 +649,14 @@ class Dataset(object):
             # pop the first item off, add to headers
             if not header:
                 raise HeadersNeeded()
+
+            # corner case - if header is set without data
+            elif header and self.height == 0:
+                raise InvalidDimensions
+
             self.headers.insert(index, header)
 
+
         if self.height and self.width:
 
             for i, row in enumerate(self._data):