SPIGOT-4727: Fix CraftEvil for legacy plugins

src/main/java/org/bukkit/craftbukkit/util/CraftEvil.java

@@ -22,6 +22,10 @@ public class CraftEvil {
 
     static {
         for (Material material : Material.values()) {
+            if (!material.isLegacy()) {
+                continue;
+            }
+
             Preconditions.checkState(!byId.containsKey(material.getId()), "Duplicate material ID for", material);
             byId.put(material.getId(), material);
         }

src/test/java/org/bukkit/EvilTest.java

@@ -0,0 +1,23 @@
+package org.bukkit;
+
+import org.bukkit.craftbukkit.util.CraftEvil;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class EvilTest {
+
+    @Test
+    public void testFrom() {
+        Assert.assertEquals(Material.LEGACY_STONE, CraftEvil.getMaterial(1));
+    }
+
+    @Test
+    public void testTo() {
+        Assert.assertEquals(1, CraftEvil.getId(Material.LEGACY_STONE));
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void testIllegal() {
+        Material.STONE.getId();
+    }
+}