{{ if .RSSLink }}
    <a href="{{ .RSSLink }}" type="application/rss+xml" target="_blank" title="RSS" class="fa fa-rss"></a>
{{ else }}
    <a href="{{ .Site.RSSLink }}" type="application/rss+xml" target="_blank" title="RSS" class="fa fa-rss"></a>
{{ end }}

{{ if .RSSLink }}
    <li><a href="{{ .RSSLink }}" type="application/rss+xml" target="_blank" title="RSS" class="fa fa-rss"></a></li>
{{ else }}
    <li><a href="{{ .Site.RSSLink }}" type="application/rss+xml" target="_blank" title="RSS" class="fa fa-rss"></a></li>
{{ end }}

Patch RSS icon to list
Patch RSS icon to list