FIX: Deny 0-dim arrays in try_append_to_array

Author: bluss

src/impl_owned_array.rs

@@ -258,7 +258,10 @@ impl<A, D> Array<A, D>
         A: Clone,
         D: RemoveAxis,
     {
-        assert_ne!(self.ndim(), 0, "Impossible to append to 0-dim array");
+        if self.ndim() == 0 {
+            return Err(ShapeError::from_kind(ErrorKind::IncompatibleShape));
+        }
+
         let current_axis_len = self.len_of(axis);
         let remaining_shape = self.raw_dim().remove_axis(axis);
         let array_rem_shape = array.raw_dim().remove_axis(axis);