Don't start task with missing items

src/main/java/com/raoulvdberge/refinedstorage/api/autocrafting/task/ICraftingTask.java

@@ -106,6 +106,11 @@ public interface ICraftingTask {
      */
     boolean isValid();
 
+    /**
+     * @return whether this crafting task has missing items
+     */
+    boolean hasMissing();
+
     /**
      * {@link ICraftingTask#calculate()} must be run before this!
      *

src/main/java/com/raoulvdberge/refinedstorage/api/network/INetworkMaster.java

@@ -185,11 +185,12 @@ public interface INetworkMaster {
 
                 task.calculate();
 
-                // @TODO: Only schedule when there are no items missing?
+                if (!task.hasMissing()) {
                     addCraftingTask(task);
                 }
             }
         }
+    }
 
     /**
      * Sends a grid update packet with all the items to all clients that are watching a grid connected to this network.

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/autocrafting/task/CraftingTask.java

@@ -474,6 +474,11 @@ public class CraftingTask implements ICraftingTask {
         return !recurseFound;
     }
 
+    @Override
+    public boolean hasMissing() {
+        return !missing.isEmpty();
+    }
+
     @Override
     public List<ICraftingPreviewElement> getPreviewStacks() {
         if (!isValid()) {

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/network/grid/ItemGridHandler.java

@@ -145,10 +145,14 @@ public class ItemGridHandler implements IItemGridHandler {
 
         if (stack != null) {
             ICraftingTask task = new CraftingTask(network, stack, network.getPattern(stack), quantity);
+
             task.calculate();
+
+            if (!task.hasMissing()) {
                 network.addCraftingTask(task);
             }
         }
+    }
 
     @Override
     public void onCraftingCancelRequested(int id) {