simplify

Author: ilia-kats

src/mudata/_core/mudata.py

@@ -519,11 +519,7 @@ def __getitem__(self, index) -> AnnData | MuData:
             except KeyError as e:
                 if index.acc.dim in ("obs", "var"):
                     for modname, mod in self._mod.items():
-                        try:
-                            index.acc.get(mod, index.idx)
-                        except KeyError:
-                            pass
-                        else:
+                        if index in mod:
                             raise KeyError(
                                 f"There is no key {index.idx} in MuData .{index.acc.dim} but there is one in {modname} .{index.acc.dim}. Consider running `pull_{index.acc.dim}()` to update global .{index.acc.dim}."
                             ) from e