Fix potential NPE in ForgeHooks.onItemPlaceIntoWorld when passing in null player. (#7505)

src/main/java/net/minecraftforge/common/ForgeHooks.java

@@ -674,7 +674,8 @@ public class ForgeHooks
 
                     world.markAndNotifyBlock(snap.getPos(), world.getChunkAt(snap.getPos()), oldBlock, newBlock, updateFlag, 512);
                 }
-                player.addStat(Stats.ITEM_USED.get(item));
+                if (player != null)
+                    player.addStat(Stats.ITEM_USED.get(item));
             }
         }
         world.capturedBlockSnapshots.clear();