revert change to make mobspawners drop a spawner of that type

removed some debug code
fixed a 1.5 compatibility issue

src/main/java/net/minecraft/server/BlockMobSpawner.java

@@ -17,7 +17,7 @@ public class BlockMobSpawner extends BlockContainer {
     }
 
     public int a(Random random) {
-        return 1; // CraftBukkit
+        return 0; // CraftBukkit
     }
 
     // CraftBukkit start

src/main/java/net/minecraft/server/EntityTypes.java

@@ -29,7 +29,7 @@ public class EntityTypes {
                 entity = (Entity) oclass.getConstructor(new Class[] { World.class}).newInstance(new Object[] { world});
             }
         } catch (Exception exception) {
-            exception.printStackTrace();
+            // CraftBukkit - don't do anything here
         }
 
         return entity;
@@ -45,7 +45,7 @@ public class EntityTypes {
                 entity = (Entity) oclass.getConstructor(new Class[] { World.class}).newInstance(new Object[] { world});
             }
         } catch (Exception exception) {
-            exception.printStackTrace();
+            // CraftBukkit - don't do anything here
         }
 
         if (entity != null) {

src/main/java/net/minecraft/server/TileEntityMobSpawner.java

@@ -28,11 +28,10 @@ public class TileEntityMobSpawner extends TileEntity {
 
     public void setId(int id) {
         mobName = EntityTypes.getNameFromClass(EntityTypes.getClassFromId(id));
-        if(mobName == null || mobName.isEmpty()) mobName = "Pig";
-        try {
-            EntityTypes.a(mobName,  world);
+        if (mobName == null || mobName.length() == 0) {
+            mobName = "Pig";
         }
-        catch (Throwable t) { // If we get any error at all, fallback to a Pig
+        if  (EntityTypes.a(mobName,  world) == null) {
             mobName = "Pig";
         }
     }