Fix CPU Clusters consisting only of addon blocks not being recognized (#274)

src/main/java/appeng/me/cache/CraftingGridCache.java

@@ -63,6 +63,7 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
 import java.util.concurrent.ThreadFactory;
+import java.util.stream.StreamSupport;
 
 
 public class CraftingGridCache implements ICraftingGrid, ICraftingProviderHelper, ICellProvider, IMEInventoryHandler<IAEItemStack> {
@@ -285,7 +286,8 @@ public class CraftingGridCache implements ICraftingGrid, ICraftingProviderHelper
     private void updateCPUClusters() {
         this.craftingCPUClusters.clear();
 
-        for (final IGridNode cst : this.grid.getMachines(TileCraftingStorageTile.class)) {
+        for (Object cls: StreamSupport.stream(grid.getMachinesClasses().spliterator(), false).filter(TileCraftingStorageTile.class::isAssignableFrom).toArray()) {
+            for (final IGridNode cst : this.grid.getMachines((Class<? extends IGridHost>) cls)) {
                 final TileCraftingStorageTile tile = (TileCraftingStorageTile) cst.getMachine();
                 final CraftingCPUCluster cluster = (CraftingCPUCluster) tile.getCluster();
                 if (cluster != null) {
@@ -296,6 +298,7 @@ public class CraftingGridCache implements ICraftingGrid, ICraftingProviderHelper
                     }
                 }
             }
+        }
 
     }