Only apply on non-empty agg_axis

Author: Daniel Saxton

pandas/core/apply.py

@@ -212,7 +212,7 @@ def apply_empty_result(self):
             except Exception:
                 pass
 
-        if reduce:
+        if reduce and len(self.agg_axis):
             r = self.f(Series([]), *self.args, **self.kwds)
             return self.obj._constructor_sliced(r, index=self.agg_axis)
         else: