fix broken build

Author: chfw

tests/base.py

@@ -1,5 +1,6 @@
 import pyexcel
 import os
+from nose.tools import raises
 
 
 def create_sample_file1(file):
@@ -139,11 +140,14 @@ def test_formats(self):
         # int
         assert self.data["Sheet1"][0][6] == "Int"
         assert self.data["Sheet1"][1][6] == 3
-        assert self.data["Sheet1"][2][6] == ""
         assert self.data["Sheet1"][4][6] == 11
         # Scientifed not supported
         assert self.data["Sheet1"][1][7] == 100000
         # Fraction
         assert self.data["Sheet1"][1][8] == 1.25
         # Text
         assert self.data["Sheet1"][1][9] == "abc"
+
+        @raises(IndexError)
+        def test_no_excessive_trailing_columns(self):
+            assert self.data["Sheet1"][2][6] == ""