Allow usage of any_projects? with an Array

In some cases we pass an Array to this method which would previously
fail since Array does not respond to "limit_value".

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/3646

app/helpers/projects_helper.rb

@@ -234,6 +234,8 @@ module ProjectsHelper
   # If no limit is applied we'll just issue a COUNT since the result set could
   # be too large to load into memory.
   def any_projects?(projects)
+    return projects.any? if projects.is_a?(Array)
+
     if projects.limit_value
       projects.to_a.any?
     else

spec/helpers/projects_helper_spec.rb

@@ -432,9 +432,7 @@ describe ProjectsHelper do
   end
 
   describe '#any_projects?' do
-    before do
-      create(:project)
-    end
+    let!(:project) { create(:project) }
 
     it 'returns true when projects will be returned' do
       expect(helper.any_projects?(Project.all)).to eq(true)
@@ -444,6 +442,14 @@ describe ProjectsHelper do
       expect(helper.any_projects?(Project.none)).to eq(false)
     end
 
+    it 'returns true when using a non-empty Array' do
+      expect(helper.any_projects?([project])).to eq(true)
+    end
+
+    it 'returns false when using an empty Array' do
+      expect(helper.any_projects?([])).to eq(false)
+    end
+
     it 'only executes a single query when a LIMIT is applied' do
       relation = Project.limit(1)
       recorder = ActiveRecord::QueryRecorder.new do