Just delete instead of zeroing.

master/bt5/vifib_web/SkinTemplateItem/portal_skins/vifib_hosting_theme/vifib_hosting_js/vifib.js.xml

@@ -8,7 +8,7 @@
       <dictionary>
         <item>
             <key> <string>_EtagSupport__etag</string> </key>
-            <value> <string>ts22668107.6</string> </value>
+            <value> <string>ts22729428.22</string> </value>
         </item>
         <item>
             <key> <string>__name__</string> </key>
@@ -114,8 +114,9 @@ function hasher() {\n
 \n
 function resetCategoryHash() {\n
   $(\'.software_category_selected\').removeClass(\'software_category_selected\');\n
-  query_kw = $.deparam.fragment();\n
-  query_kw[\'software_category\'] = \'\';\n
+  var query_kw = $.deparam.fragment();\n
+  delete(query_kw.software_category);\n
+  debugger;\n
   window.location.hash = \'#\'+$.param(query_kw);\n
 }\n
 \n
@@ -352,7 +353,7 @@ function hashController ()\n
         </item>
         <item>
             <key> <string>size</string> </key>
-            <value> <int>10196</int> </value>
+            <value> <int>10212</int> </value>
         </item>
         <item>
             <key> <string>title</string> </key>