MageServerImpl refactoring. More event logging.

Mage.Common/src/mage/utils/ActionWithNullNegativeResult.java

@@ -0,0 +1,15 @@
+package mage.utils;
+
+import mage.interfaces.ActionWithResult;
+
+/**
+ * This class always returns null independently from type <T> used.
+ *
+ * @author noxx
+ */
+public abstract class ActionWithNullNegativeResult<T> implements ActionWithResult<T> {
+    @Override
+    public T negativeResult() {
+        return null;
+    }
+}