fix: avoid unnessary EH for control (#709)

Author: henryiii

src/boost_histogram/_internal/hist.py

@@ -764,11 +764,10 @@ def __getitem__(  # noqa: C901
 
         # If this is (now) all integers, return the bin contents
         # But don't try *dict!
-        if not hasattr(indexes, "items"):
-            try:
-                return self._hist.at(*indexes)  # type: ignore[no-any-return]
-            except RuntimeError:
-                pass
+        if not hasattr(indexes, "items") and all(
+            isinstance(a, SupportsIndex) for a in indexes
+        ):
+            return self._hist.at(*indexes)  # type: ignore[no-any-return]
 
         integrations: Set[int] = set()
         slices: List[_core.algorithm.reduce_command] = []
@@ -777,8 +776,8 @@ def __getitem__(  # noqa: C901
 
         # Compute needed slices and projections
         for i, ind in enumerate(indexes):
-            if hasattr(ind, "__index__"):
-                pick_each[i] = ind.__index__() + (  # type: ignore[union-attr]
+            if isinstance(ind, SupportsIndex):
+                pick_each[i] = ind.__index__() + (
                     1 if self.axes[i].traits.underflow else 0
                 )
                 continue