Follow up PR: pandas-dev#28097 Simplify branch statement

Author: proost

pandas/core/indexes/base.py

@@ -814,19 +814,13 @@ def take(self, indices, axis=0, allow_fill=True, fill_value=None, **kwargs):
         if kwargs:
             nv.validate_take(tuple(), kwargs)
         indices = ensure_platform_int(indices)
-        if self._can_hold_na:
-            taken = self._assert_take_fillable(
-                self.values,
-                indices,
-                allow_fill=allow_fill,
-                fill_value=fill_value,
-                na_value=self._na_value,
-            )
-        else:
-            if allow_fill and fill_value is not None:
-                msg = "Unable to fill values because {0} cannot contain NA"
-                raise ValueError(msg.format(self.__class__.__name__))
-            taken = self.values.take(indices)
+        taken = self._assert_take_fillable(
+            self.values,
+            indices,
+            allow_fill=allow_fill,
+            fill_value=fill_value,
+            na_value=self._na_value,
+        )
         return self._shallow_copy(taken)
 
     def _assert_take_fillable(
@@ -839,7 +833,10 @@ def _assert_take_fillable(
 
         # only fill if we are passing a non-None fill_value
         if allow_fill and fill_value is not None:
-            if (indices < -1).any():
+            if not self._can_hold_na and len(values):
+                msg = "Unable to fill values because {0} cannot contain NA"
+                raise ValueError(msg.format(self.__class__.__name__))
+            elif (indices < -1).any():
                 msg = (
                     "When allow_fill=True and fill_value is not None, "
                     "all indices must be >= -1"

pandas/core/indexes/multi.py

@@ -1308,10 +1308,7 @@ def _get_grouper_for_level(self, mapper, level):
             # Remove unobserved levels from level_index
             level_index = level_index.take(uniques)
 
-        if len(level_index):
-            grouper = level_index.take(codes)
-        else:
-            grouper = level_index.take(codes, fill_value=True)
+        grouper = level_index.take(codes, fill_value=True)
 
         return grouper, codes, level_index