How to show a message if the search doesn’t match the result?

I am using node js and templates of ejs in my application, and I am trying to show a message in case the search field doesn’t match any result, I expected it will show me “Line does not exist.”, but it shows the search results instead as shown in the screenshot below:

I tried to modify the condition in the if statement <% } else if(oneresult != ''){ %> in different ways but it doesn’t work. Below is the code:

<%- include('partials/header') -%>

<div class="container mt-5 w-50">
  <h2 class="mb-4">Search a Line</h2>

  <form action="/line" method="GET">
    <input
      type="text"
      name="line"
      class="form-control"
      placeholder="Enter a Line"
    />

    <button type="submit" class="btn btn-danger btn-block mt-3">
      Search in Database
    </button>
  </form>

  <% if(oneresult) { %>
  <h4 class="text-danger my-4">Search Results:</h4>
  <table class="table table-bordered" width="100%" cellspacing="0">
    <thead>
      <tr>
        <th>ID</th>
        <th>Line</th>
        <th>Date</th>
      </tr>
    </thead>

    <tbody>
      <% oneresult.forEach( oneresult=>{ %>
      <tr>
        <td><%= oneresult.id %></td>
        <td><%= oneresult.result %></td>
        <td><%= oneresult.date %></td>
      </tr>
      <% }) %>
    </tbody>
  </table>
  <% } else if(oneresult != ''){ %>

  <div class="alert alert-danger mt-4">Line does not exist.</div>

  <% } %>
</div>

<%- include('partials/footer') -%>

Any suggestions, please?