Height Set fails on grid = null

[Delaylah]

Hi, I just want to say great idea to make this accessible for Blazor, and big thanks!

I found small issue with initialization of Height in ItemOptions.js. If grid is null, it will throw exception and its not handled properly as in other attributes. So new set should be :
`
[JsonProperty]

    public int Height
    {
        get { return _Height; }
        set
        {
            if (value != _Height)
            {
                _Height = value;

                if (!suppressevents)
                {
                    changed();
                    if (grid != null)
                    grid.GridJS.update(this.ElementID, this._X, this._Y, this._Width, this._Height);
                }
            }
        }
    }`

Also I was trying to setup noMove, but its not working. Object is still movable even if we set noMove = true;

Thanks again!
Ajla