<span id="tab_list">
    {{#if stream_settings_link}}
        <a class="stream" href="{{stream_settings_link}}">
            {{> navbar_icon_and_title }}
        </a>
        <a class="sub_count no-style" data-toggle="tooltip" title="{{sub_count_tooltip_text}}" href="{{stream_settings_link}}">
            <i class="fa fa-user-o"></i>{{formatted_sub_count}}
        </a>
        {{#if rendered_narrow_description}}
        <span class="narrow_description rendered_markdown" data-toggle="tooltip">{{rendered_markdown rendered_narrow_description}}</span>
        {{else}}
        <span class="narrow_description rendered_markdown" data-toggle="tooltip">{{t "(no description)"}}</span>
        {{/if}}
    {{else}}
        <span>
            {{> navbar_icon_and_title }}
        </span>
    {{/if}}
    <span class="search_icon search_closed" ><i class="fa fa-search" aria-hidden="true"></i></span>
</span>

<span id="tab_list">
    {{#if stream_settings_link}}
        <a class="stream" href="{{stream_settings_link}}">
            {{> navbar_icon_and_title }}
        </a>
        <a class="sub_count no-style" data-toggle="tooltip" title="{{sub_count_tooltip_text}}" href="{{stream_settings_link}}">
            <i class="fa fa-user-o"></i>{{formatted_sub_count}}
        </a>
        <span class="narrow_description rendered_markdown" data-toggle="tooltip">
        {{#if rendered_narrow_description}}
            {{rendered_markdown rendered_narrow_description}}
        {{else}}
            {{t "(no description)"}}
        {{/if}}
        </span>
    {{else}}
        <span>
            {{> navbar_icon_and_title }}
        </span>
    {{/if}}
    <span class="search_icon search_closed" ><i class="fa fa-search" aria-hidden="true"></i></span>
</span>

Simplify narrow_description conditional in hbs template.
navbar: Simplify narrow_description conditional in hbs template.

Previously, we had the entire div within the conditional, instead of
just the contents, which were the only variable elements.

This change moves the conditional over just the contents of the div
and improves readability.
