Merge pull request #150 from iurisilvio/fix-csv-none

Fixed #149 Csv with None should return an empty list.

Author: iurisilvio

decouple.py

@@ -271,6 +271,9 @@ def __init__(self, cast=text_type, delimiter=',', strip=string.whitespace, post_
 
     def __call__(self, value):
         """The actual transformation"""
+        if value is None:
+            return self.post_process()
+
         transform = lambda s: self.cast(s.strip(self.strip))
 
         splitter = shlex(value, posix=True)

tests/test_helper_csv.py

@@ -29,3 +29,8 @@ def test_csv_quoted_parse():
     assert ['foo', "'bar, baz'", "'qux"] == csv(''' foo ,"'bar, baz'", "'qux"''')
 
     assert ['foo', '"bar, baz"', '"qux'] == csv(""" foo ,'"bar, baz"', '"qux'""")
+
+
+def test_csv_none():
+    csv = Csv()
+    assert [] == csv(None)