CLN: consolidating stargets if statement (#35498)

alexhlim · alexhlim · commit e66128c20003 · 2020-12-24T15:22:03.000-05:00
diff --git a/pandas/_libs/index.pyx b/pandas/_libs/index.pyx
@@ -278,7 +278,7 @@ cdef class IndexEngine:
         values_mask = isnaobj(values)
         targets_mask = isnaobj(targets)
         stargets = set(targets)
-        if targets_mask.any():
+        if -1 not in stargets and targets_mask.any():
             stargets.add(-1)
         n = len(values)
         n_t = len(targets)
