changed indent

Author: HaruguchiKazuto

pandas/tests/groupby/aggregate/test_aggregate.py

@@ -883,7 +883,7 @@ def test_missing_raises(self):
             df.groupby("A").agg(c=("C", "sum"))
 
     def test_groupby_aggregation_empty_group():
-    # https://github.com/pandas-dev/pandas/issues/18869
+        # https://github.com/pandas-dev/pandas/issues/18869
         def f(x):
             if len(x) == 0:
                 raise ValueError("length must not be 0")