Bug fix

Author: lshaw8317

src/blosc2/lazyexpr.py

@@ -2342,8 +2342,11 @@ def __init__(self, new_op):  # noqa: C901
             if isinstance(value1, LazyExpr):
                 self.expression = value1.expression if op is None else f"{op}({value1.expression})"
                 # handle constructors which can give empty operands
-                _out = _numpy_eval_expr(f"{op}(o0)", {"o0": value1}, prefer_blosc=False)
-                self._dtype = _out.dtype
+                self._dtype = (
+                    value1.dtype
+                    if op is None
+                    else _numpy_eval_expr(f"{op}(o0)", {"o0": value1}, prefer_blosc=False).dtype
+                )
                 self.operands = value1.operands
             else:
                 if np.isscalar(value1):