Merge branch 'qa-fix-issue-resource' into 'master'

Fix failing e2e tests - initialize Issue labels

See merge request gitlab-org/gitlab-ce!30375

qa/qa/resource/issue.rb

@@ -16,6 +16,10 @@ module QA
       attribute :labels
       attribute :title
+      def initialize
+        @labels = []
+      end
+
       def fabricate!
         project.visit!
@@ -38,7 +42,7 @@ module QA
       def api_post_body
         {
-          labels: [labels],
+          labels: labels,
           title: title
         }
       end