如何从绑定到XML文档的TreeView中删除空行？

Question

昨天经过StackOverflow之后，我找到了一个解决方案，解决了在答案here中将XML文档绑定到树视图的问题。它就像一个魅力，有一个问题：现在我在每个节点的顶​​部都有一个空行，每个节点都有一个空白行。

我对如何摆脱它感到茫然。

这是XML：

<Window.Resources>
    <outboundInterfaceTestService:TrueToVisibleConverter x:Key="TrueToVisibleConverter" />
    <outboundInterfaceTestService:TrueToCollapsedConverter x:Key="TrueToCollapsedConverter" />
    <HierarchicalDataTemplate x:Key="NodeTemplate">
        <TextBlock x:Name="text" Text="" />
        <HierarchicalDataTemplate.ItemsSource>
            <Binding XPath="child::node()|attribute::*" />
        </HierarchicalDataTemplate.ItemsSource>
        <HierarchicalDataTemplate.Triggers>
            <DataTrigger Binding="{Binding Path=NodeType}" Value="Text">
                <Setter TargetName="text" Property="Foreground" Value="Red" />
                <Setter TargetName="text" Property="Text" Value="{Binding Path=Value}" />
            </DataTrigger>
            <DataTrigger Binding="{Binding Path=NodeType}" Value="Element">
                <Setter TargetName="text" Property="Text" Value="{Binding Path=Name}" />
            </DataTrigger>
        </HierarchicalDataTemplate.Triggers>
    </HierarchicalDataTemplate>
</Window.Resources>

<!-- snip! -->
<!-- later on, the TreeView itself -->
<TreeView Name="ContentTree"
            Grid.Row="3"
            ItemsSource="{Binding Path=SelectedItem.ContentXmlDoc}"
            ItemTemplate="{StaticResource NodeTemplate}"
            Visibility="{Binding Path=SelectedItem.IsError,
                                Converter={StaticResource TrueToCollapsedConverter}}">
    <TreeView.ItemContainerStyle>
        <Style TargetType="TreeViewItem">
            <Setter Property="IsExpanded" Value="True" />
        </Style>
    </TreeView.ItemContainerStyle>
</TreeView>

不幸的是，这就是它的样子。我已经圈出了空白区域，但实际上它们非常明显 - 至少，大块是;小家伙可能被误认为是填充，但事实并非如此。

有什么想法？我无法摆脱TextBlock，因为它被DataTriggers使用，所以我不知道我在这里缺少什么。而且，这是我第一次尝试这个，我甚至不确定从哪里开始。

更新 这是XML，按要求：

<?xml version='1.0' encoding='UTF-8'?>
<DataUpdate>
  <EndpointId></EndpointId>
  <MessageId></MessageId>
  <UpdateList>
    <ChargeItem>
      <TenantId></TenantId>
      <PatientId></PatientId>
      <LastName></LastName>
      <FirstName></FirstName>
      <PatientGender></PatientGender>
      <EncounterId></EncounterId>
      <AttPhysicianId></AttPhysicianId>
      <AttPhysicianLast></AttPhysicianLast>
      <TransactionId></TransactionId>
      <TransactionDate></TransactionDate>
      <PostingDate></PostingDate>
      <TransactionCode></TransactionCode>
      <TransactionDesc></TransactionDesc>
      <TransactionAltDesc></TransactionAltDesc>
      <TransactionQuantity></TransactionQuantity>
      <TransactionAmount></TransactionAmount>
      <TransactionUnitAmt></TransactionUnitAmt>
      <DepartmentCode></DepartmentCode>
      <InsurancePlanId></InsurancePlanId>
      <InsuranceAmount></InsuranceAmount>
      <PatientLocation></PatientLocation>
      <FeeScheduleId></FeeScheduleId>
      <Patienttype></Patienttype>
      <DiagnosisCode></DiagnosisCode>
      <DiagnosisText></DiagnosisText>
      <DiagnosisCodeType></DiagnosisCodeType>
      <PerformedById></PerformedById>
      <PerformedByLast></PerformedByLast>
      <PerformedByFirst></PerformedByFirst>
      <OrderedById></OrderedById>
      <OrderedByLast></OrderedByLast>
      <OrderedByFirst></OrderedByFirst>
      <UnitCost></UnitCost>
      <FillerOrderNumber></FillerOrderNumber>
      <EnteredById></EnteredById>
      <EnteredByLast></EnteredByLast>
      <EnteredByFirst></EnteredByFirst>
      <ProcedureCode></ProcedureCode>
      <ProcedureCodeMod></ProcedureCodeMod>
      <NdcCode></NdcCode>
    </ChargeItem>
    <ChargeItem>
      <TenantId></TenantId>
      <PatientId></PatientId>
      <LastName></LastName>
      <FirstName></FirstName>
      <PatientGender></PatientGender>
      <EncounterId></EncounterId>
      <AttPhysicianId></AttPhysicianId>
      <AttPhysicianLast></AttPhysicianLast>
      <TransactionId></TransactionId>
      <TransactionDate></TransactionDate>
      <PostingDate></PostingDate>
      <TransactionCode></TransactionCode>
      <TransactionDesc></TransactionDesc>
      <TransactionAltDesc></TransactionAltDesc>
      <TransactionQuantity></TransactionQuantity>
      <TransactionAmount></TransactionAmount>
      <TransactionUnitAmt></TransactionUnitAmt>
      <DepartmentCode></DepartmentCode>
      <InsurancePlanId></InsurancePlanId>
      <InsuranceAmount></InsuranceAmount>
      <PatientLocation></PatientLocation>
      <FeeScheduleId></FeeScheduleId>
      <Patienttype></Patienttype>
      <DiagnosisCode></DiagnosisCode>
      <DiagnosisText></DiagnosisText>
      <DiagnosisCodeType></DiagnosisCodeType>
      <PerformedById></PerformedById>
      <PerformedByLast></PerformedByLast>
      <PerformedByFirst></PerformedByFirst>
      <OrderedById></OrderedById>
      <OrderedByLast></OrderedByLast>
      <OrderedByFirst></OrderedByFirst>
      <UnitCost></UnitCost>
      <FillerOrderNumber></FillerOrderNumber>
      <EnteredById></EnteredById>
      <EnteredByLast></EnteredByLast>
      <EnteredByFirst></EnteredByFirst>
      <ProcedureCode></ProcedureCode>
      <ProcedureCodeMod></ProcedureCodeMod>
      <NdcCode></NdcCode>
    </ChargeItem>
  </UpdateList>
</DataUpdate>