Remove some nasty code.

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/network/node/NetworkNodeGrid.java

@@ -21,7 +21,6 @@ import com.raoulvdberge.refinedstorage.apiimpl.API;
 import com.raoulvdberge.refinedstorage.apiimpl.storage.StorageCacheListenerGridFluid;
 import com.raoulvdberge.refinedstorage.apiimpl.storage.StorageCacheListenerGridItem;
 import com.raoulvdberge.refinedstorage.block.BlockGrid;
-import com.raoulvdberge.refinedstorage.container.ContainerGrid;
 import com.raoulvdberge.refinedstorage.inventory.ItemHandlerBase;
 import com.raoulvdberge.refinedstorage.inventory.ItemHandlerFilter;
 import com.raoulvdberge.refinedstorage.inventory.ItemHandlerListenerNetworkNode;
@@ -87,10 +86,10 @@ public class NetworkNodeGrid extends NetworkNode implements IGridNetworkAware {
             super.onContentsChanged(slot);
 
             ItemStack pattern = getStackInSlot(slot);
-            if (slot == 1 && !pattern.isEmpty()) {
+            if (slot == 1 && !pattern.isEmpty() && world != null) {
                 boolean isPatternProcessing = ItemPattern.isProcessing(pattern);
 
-                if (isPatternProcessing && processingPattern) {
+                if (isPatternProcessing && isProcessingPattern()) {
                     for (int i = 0; i < 9; ++i) {
                         matrixProcessing.setStackInSlot(i, StackUtils.nullToEmpty(ItemPattern.getInputSlot(pattern, i)));
                     }
@@ -98,13 +97,11 @@ public class NetworkNodeGrid extends NetworkNode implements IGridNetworkAware {
                     for (int i = 0; i < 9; ++i) {
                         matrixProcessing.setStackInSlot(9 + i, StackUtils.nullToEmpty(ItemPattern.getOutputSlot(pattern, i)));
                     }
-                } else if (!isPatternProcessing && !processingPattern) {
+                } else if (!isPatternProcessing && !isProcessingPattern()) {
                     for (int i = 0; i < 9; ++i) {
                         matrix.setInventorySlotContents(i, StackUtils.nullToEmpty(ItemPattern.getInputSlot(pattern, i)));
                     }
                 }
-
-                sendSlotUpdate(false);
             }
         }
 
@@ -405,23 +402,6 @@ public class NetworkNodeGrid extends NetworkNode implements IGridNetworkAware {
         }
     }
 
-    public void sendSlotUpdate(boolean initSlots) {
-        if (!world.isRemote) {
-            world.getMinecraftServer()
-                .getPlayerList()
-                .getPlayers()
-                .stream()
-                .filter(player -> player.openContainer instanceof ContainerGrid && ((ContainerGrid) player.openContainer).getTile() != null && ((ContainerGrid) player.openContainer).getTile().getPos().equals(pos))
-                .forEach(player -> {
-                    if (initSlots) {
-                        ((ContainerGrid) player.openContainer).initSlots();
-                    }
-
-                    ((ContainerGrid) player.openContainer).sendAllSlots();
-                });
-        }
-    }
-
     @Override
     public void onClosed(EntityPlayer player) {
         // NO OP

src/main/java/com/raoulvdberge/refinedstorage/network/MessageGridClear.java

@@ -47,8 +47,6 @@ public class MessageGridClear extends MessageHandlerPlayerToServer<MessageGridCl
             } else if (grid.getType() == GridType.PATTERN) {
                 ((NetworkNodeGrid) grid).clearMatrix();
             }
-
-            ((NetworkNodeGrid) grid).sendSlotUpdate(false);
         }
     }
 }

src/main/java/com/raoulvdberge/refinedstorage/tile/grid/TileGrid.java

@@ -3,6 +3,7 @@ package com.raoulvdberge.refinedstorage.tile.grid;
 import com.raoulvdberge.refinedstorage.api.network.grid.GridType;
 import com.raoulvdberge.refinedstorage.api.network.grid.IGrid;
 import com.raoulvdberge.refinedstorage.apiimpl.network.node.NetworkNodeGrid;
+import com.raoulvdberge.refinedstorage.container.ContainerGrid;
 import com.raoulvdberge.refinedstorage.gui.GuiBase;
 import com.raoulvdberge.refinedstorage.gui.grid.GuiGrid;
 import com.raoulvdberge.refinedstorage.tile.TileNode;
@@ -70,7 +71,16 @@ public class TileGrid extends TileNode<NetworkNodeGrid> {
         t.getNode().setProcessingPattern(v);
         t.getNode().clearMatrix();
         t.getNode().markDirty();
-        t.getNode().sendSlotUpdate(true);
+
+        t.getWorld().getMinecraftServer()
+            .getPlayerList()
+            .getPlayers()
+            .stream()
+            .filter(player -> player.openContainer instanceof ContainerGrid && ((ContainerGrid) player.openContainer).getTile() != null && ((ContainerGrid) player.openContainer).getTile().getPos().equals(t.getPos()))
+            .forEach(player -> {
+                ((ContainerGrid) player.openContainer).initSlots();
+                ((ContainerGrid) player.openContainer).sendAllSlots();
+            });
     }, (initial, p) -> GuiBase.executeLater(GuiGrid.class, GuiBase::initGui));
 
     public static void trySortGrid(boolean initial) {