Fetch last build if no branch specified.

This restores backwards compatibility with the current behaviour
rather than defaulting to master. Though the latter would probably
the right thing to do in the longer term.

lib/travis/api/app/responders/xml.rb

@@ -6,14 +6,14 @@ module Travis::Api::App::Responders
   class Xml < Base
     TEMPLATE_ERB = ERB.new <<-EOF
 <Projects>
-<% @resource.each  do |r| %>
+<% @resource.each  do |repository| %>
-  <% next  if r.last_completed_build(branch).nil? -%>
+  <% next  if build(repository).nil? -%>
   <Project
     name="<%= r.slug %>"
-    activity="<%= ACTIVITY[r.last_completed_build(branch).state.to_sym] || ACTIVITY[:default] %>"
+    activity="<%= ACTIVITY[build(repository).state.to_sym] || ACTIVITY[:default] %>"
-    lastBuildStatus="<%= STATUS[r.last_completed_build(branch).state.to_sym] || STATUS[:default]  %>"
+    lastBuildStatus="<%= STATUS[build(repository).state.to_sym] || STATUS[:default]  %>"
-    lastBuildLabel="<%= r.last_completed_build(branch).try(:number) %>"
+    lastBuildLabel="<%= build(repository).try(:number) %>"
-    lastBuildTime="<%= r.last_completed_build(branch).finished_at.try(:strftime, '%Y-%m-%dT%H:%M:%S.%L%z') %>"
+    lastBuildTime="<%= build(repository).finished_at.try(:strftime, '%Y-%m-%dT%H:%M:%S.%L%z') %>"
     webUrl="https://<%= Travis.config.client_domain %>/<%= r.slug %>" />
 <% end  %>
 </Projects>
@@ -44,7 +44,15 @@ module Travis::Api::App::Responders
     end
 
     def branch
-      params[:branch].present? ? params[:branch] : 'master'
+      params[:branch]
+    end
+
+    def build(repository)
+      if branch.present?
+        repository.last_complete_build(branch)      
+      else
+        repository.last_build
+      end
     end
 
     private