getter works in empty index case

toolz/itertoolz.py

@@ -690,8 +690,10 @@ def getter(index):
         if len(index) == 1:
             index = index[0]
             return lambda x: (x[index],)
-        else:
+        elif index:
             return operator.itemgetter(*index)
+        else:
+            return lambda x: ()
     else:
         return operator.itemgetter(index)
 

toolz/tests/test_itertoolz.py

@@ -4,7 +4,7 @@
 from functools import partial
 from toolz.itertoolz import (remove, groupby, merge_sorted,
                              concat, concatv, interleave, unique,
-                             isiterable,
+                             isiterable, getter,
                              mapcat, isdistinct, first, second,
                              nth, take, drop, interpose, get,
                              rest, last, cons, frequencies,
@@ -315,6 +315,12 @@ def addpair(pair):
     assert result == expected
 
 
+def test_getter():
+    assert getter(0)('Alice') == 'A'
+    assert getter([0])('Alice') == ('A',)
+    assert getter([])('Alice') == ()
+
+
 def test_key_as_getter():
     squares = [(i, i**2) for i in range(5)]
     pows = [(i, i**2, i**3) for i in range(5)]