<div class="govuk-emergency-banner <%= banner.campaign_class %>" role="banner">
  <div>
    <h1><%= banner.heading %></h1>
    <p>
      <%= banner.short_description %>
    </p>
    <% if banner.link %>
      <a href="<%= banner.link %>">More information</a>
    <% end %>
  </div>
</div>

<div class="govuk-emergency-banner <%= banner.campaign_class %>" role="banner">
  <div>
    <h1><%= banner.heading %></h1>
    <% if banner.short_description %>
      <p><%= banner.short_description %></p>
    <% end %>
    <% if banner.link %>
      <a href="<%= banner.link %>">More information</a>
    <% end %>
  </div>
</div>

Add conditional around short_description in emergency banner
Add conditional around short_description in emergency banner

This should prevent any unnecessary paragraphs appearing in the banner.
