Added Mixin for skipping entities with missing mandatory attributes in mapped structure.

lib/sequencer/unit/import/common/model/skip/missing_mandatory/mapped.rb

@@ -0,0 +1,17 @@
+class Sequencer
+  class Unit
+    module Import
+      module Common
+        module Model
+          module Skip
+            module MissingMandatory
+              class Mapped < Sequencer::Unit::Import::Common::Model::Skip::MissingMandatory::Base
+                uses :mapped
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+end