node-red/nodes/core/core/98-unknown.html

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<script type="text/x-red" data-template-name="unknown">
    <div class="form-tips"><p>This node is a type unknown to your installation of Node-RED.</p>
    <p><i>If you deploy with the node in this state, it will lose all of its configuration.</i></p>
    <p>See the Info side bar for more help</p></div>
</script>

<script type="text/x-red" data-help-name="unknown">
    <p>This node is a type unknown to your installation of Node-RED.</p>
    <p><i>If you deploy with the node in this state, it will lose all of its configuration.</i></p>
    <p>It is possible this node type is already installed, but is missing a dependency. Check the Node-RED start-up log for
       any error messages associated with the missing node type. Use <b>npm install &lt;module&gt;</b> to install any missing modules
       and restart Node-RED and reimport the nodes.</p>
    <p>Otherwise, you should contact the author of the flow to obtain a copy of the missing node type.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('unknown',{
        category: 'unknown',
        color:"#fff0f0",
        defaults: {
            name: {value:""}
        },
        inputs:1,
        outputs:1,
        icon: "",
        label: function() {
            return "("+this.name+")"||"unknown";
        },
        labelStyle: function() {
            return "node_label_unknown";
        }
    });
</script>