Empty tag search will look for not tagged links

Fixes #784

From now, searching for tags with an empty value will return only not tagged links,
with the search bar showing `x results [not tagged]`.

Note that using the api, the searchtags request parameter must be set to `false` to get the same result.

  - [ ] Update API doc

2 files changed, 10 insertions, 2 deletions

diff --git a/tpl/default/linklist.html b/tpl/default/linklist.html
index 57ef4567..3d6be529 100644
--- a/tpl/default/linklist.html
+++ b/tpl/default/linklist.html
@@ -89,7 +89,7 @@
         <div id="searchcriteria">{'Nothing found.'|t}</div>
       </div>
     </div>
-  {elseif="!empty($search_term) or !empty($search_tags) or !empty($visibility)"}
+  {elseif="!empty($search_term) or $search_tags !== '' or !empty($visibility)"}
     <div class="pure-g pure-alert pure-alert-success search-result">
       <div class="pure-u-2-24"></div>
       <div class="pure-u-20-24">
@@ -105,6 +105,10 @@
                 <a href="?removetag={function="urlencode($value)"}">{$value}<span class="remove"><i class="fa fa-times"></i></span></a>
               </span>
           {/loop}
+        {elseif="$search_tags === false"}
+          <span class="label label-tag" title="{'Remove tag'|t}">
+            <a href="?">{'untagged'|t}<span class="remove"><i class="fa fa-times"></i></span></a>
+          </span>
         {/if}
         {if="!empty($visibility)"}
           {'with status'|t}
diff --git a/tpl/vintage/linklist.html b/tpl/vintage/linklist.html
index fc116667..8458caa1 100644
--- a/tpl/vintage/linklist.html
+++ b/tpl/vintage/linklist.html
@@ -55,7 +55,7 @@
 
     {if="count($links)==0"}
         <div id="searchcriteria">Nothing found.</div>
-    {elseif="!empty($search_term) or !empty($search_tags)"}
+    {elseif="!empty($search_term) or $search_tags !== ''"}
         <div id="searchcriteria">
             {$result_count} results
             {if="!empty($search_term)"}
@@ -69,6 +69,10 @@
                         <a href="?removetag={function="urlencode($value)"}">{$value} <span class="remove">x</span></a>
                     </span>
                 {/loop}
+            {elseif="$search_tags === false"}
+                <span class="linktag" title="Remove tag">
+                    <a href="?">untagged <span class="remove">x</span></a>
+                </span>
             {/if}
         </div>
     {/if}