Modify test.

A test in test_to_csv checked for the presence of exactly the behavior we're
fixing here: A file with 5 lines that asks for a header of length 5 should work
and return an empty dataframe, not error.

Author: Ben Kandel

pandas/tests/frame/test_to_csv.py

@@ -587,7 +587,7 @@ def _make_frame(names=None):
             df = _make_frame(True)
             df.to_csv(path, tupleize_cols=False)
 
-            for i in [5, 6, 7]:
+            for i in [6, 7]:
                 msg = 'len of {i}, but only 5 lines in file'.format(i=i)
                 with assertRaisesRegexp(CParserError, msg):
                     read_csv(path, tupleize_cols=False,