Made empty multipart block replaceable

codechicken/multipart/BlockMultipart.scala

@@ -174,7 +174,15 @@ trait BlockMultipart extends Block
     
     override def getRenderType() = TileMultipart.renderID
     
-    override def isAirBlock(world:World, x:Int, y:Int, z:Int) = getTile(world, x, y, z) == null || getTile(world, x, y, z).partList.isEmpty
+    override def isAirBlock(world:World, x:Int, y:Int, z:Int):Boolean = 
+    {
+        return getTile(world, x, y, z) match {
+            case null => true
+            case tile => tile.partList.isEmpty
+        }
+    }
+    
+    override def isBlockReplaceable(world:World, x:Int, y:Int, z:Int) = isAirBlock(world, x, y, z)
     
     override def getRenderBlockPass = 1
     
@@ -291,9 +299,10 @@ trait BlockMultipart extends Block
     
     override def onNeighborTileChange(world:World, x:Int, y:Int, z:Int, tileX:Int, tileY:Int, tileZ:Int)
     {
-        val tile = getTile(world, x, y, z)
-        if(tile != null)
-            tile.onNeighborTileChange(tileX, tileY, tileZ)
+        getTile(world, x, y, z) match {
+            case null => world.setBlockToAir(x, y, z)
+            case tile => tile.onNeighborTileChange(tileX, tileY, tileZ)
+        }
     }
     
     override def weakTileChanges() = true

codechicken/multipart/TileMultipart.scala

@@ -139,7 +139,7 @@ class TileMultipart extends TileEntity
     {
         internalPartChange(part)
         
-        worldObj.notifyBlocksOfNeighborChange(xCoord, yCoord, zCoord, getBlockType().blockID)
+        worldObj.notifyBlocksOfNeighborChange(xCoord, yCoord, zCoord, MultipartProxy.block.blockID)
         worldObj.updateAllLightTypes(xCoord, yCoord, zCoord)
     }
     
@@ -291,15 +291,13 @@ class TileMultipart extends TileEntity
     {
         remPart_do(part, !worldObj.isRemote)
         
-        if(!isInvalid())
+        if(!isInvalid)
         {
             notifyPartChange(part)
             markDirty()
             markRender()
-        }
-        
-        if(!isInvalid())
             return MultipartGenerator.partRemoved(this, part)
+        }
         
         return null
     }
@@ -428,7 +426,7 @@ class TileMultipart extends TileEntity
     def notifyNeighborChange(side:Int)
     {
         val pos = new BlockCoord(this).offset(side)
-        worldObj.notifyBlocksOfNeighborChange(pos.x, pos.y, pos.z, getBlockType().blockID)
+        worldObj.notifyBlocksOfNeighborChange(pos.x, pos.y, pos.z, MultipartProxy.block.blockID)
     }
 }