System.NullReferenceException when sending Form Asp.Net MVC

Ihaveaneditcontroller,whichreceivesavaluefromthedatabaseandplaysitforview,andthenIwantwiththatviewtoplaythevaluesonthescreen(basictest)...

However,evenwithmycontrollerleadingtotheeditviewpassingaBranchobject,ittellsmethatbranchisnull.Hereismycontrollerandmyview:

publicActionResultEdita(stringnome_filial){Conexaoconexao=newConexao();Filialfilial=newFilial();stringcomando="SELECT A.FILIAL, B.VALOR_PROPRIEDADE FROM FILIAIS A " +
                         "LEFT JOIN PROP_FILIAIS B ON A.FILIAL = B.FILIAL AND B.PROPRIEDADE = '00814'" +
                         "WHERE A.FILIAL = @FILIAL";

        var parametros = new Dictionary<string, object>
        {
            {"FILIAL", nome_filial}
        };
        var rows = conexao.ExecutaComandoComRetorno(comando, parametros);
        foreach (var row in rows)
        {
            filial.filial = row["FILIAL"];
            filial.estoque_max = row["VALOR_PROPRIEDADE"];
        }

        return View(filial);
    }

    [HttpPost]
    public ActionResult Edita(Filial filial) {

        return Content(filial.estoque_max.ToString() + filial.filial.ToString());
    }

VIEW:

@model MaxEstoqueFiliais.Models.Filial


@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <h4>Filial</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.filial, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.filial, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.filial, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.estoque_max, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.estoque_max, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.estoque_max, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Save" class="btn btn-default" />
            </div>
        </div>
    </div>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

Subsidiary Class:

public class Filial
{
    [DisplayName("Filial")]
    public string filial { get; set; }
    [DisplayName("Estoque Máximo")]
    public string estoque_max { get; set; }
}

Why is my branch object being null, and am I passing it to the view?

Notice that the data is taken to the view: