Small improvement.

Author: MartinSVK12

multiblocks/src/main/java/sunsetsatellite/catalyst/multiblocks/Multiblock.java

@@ -39,4 +39,19 @@ public boolean isValidAt(World world, BlockInstance origin, Direction dir){
         return true;
     }
 
+	public boolean isValidAtSilent(World world, BlockInstance origin, Direction dir){
+		dir = Direction.Z_POS;
+		ArrayList<BlockInstance> blocks = getBlocks(origin.pos,dir);
+		ArrayList<BlockInstance> substitutions = getSubstitutions(origin.pos,dir);
+		for (BlockInstance block : blocks) {
+			if (!block.exists(world)) {
+				boolean foundSub = substitutions.stream().anyMatch((BI) -> BI.pos.equals(block.pos) && BI.exists(world));
+				if (!foundSub) {
+					return false;
+				}
+			}
+		}
+		return true;
+	}
+
 }