Use exists? instead of count (#24839).

Patch by Vincent Robert and Go MAEDA.

git-svn-id: http://svn.redmine.org/redmine/trunk@16211 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/repository/git.rb

@@ -143,7 +143,7 @@ class Repository::Git < Repository
     return if prev_db_heads.sort == repo_heads.sort
 
     h["db_consistent"]  ||= {}
-    if changesets.count == 0
+    if ! changesets.exists?
       h["db_consistent"]["ordering"] = 1
       merge_extra_info(h)
       self.save

app/views/trackers/index.html.erb

@@ -16,7 +16,7 @@
   <tr class="<%= cycle("odd", "even") %>">
   <td class="name"><%= link_to tracker.name, edit_tracker_path(tracker) %></td>
   <td>
-    <% unless tracker.workflow_rules.count > 0 %>
+    <% unless tracker.workflow_rules.exists? %>
       <span class="icon icon-warning">
         <%= l(:text_tracker_no_workflow) %> (<%= link_to l(:button_edit), workflows_edit_path(:tracker_id => tracker) %>)
       </span>