Fix single slabs and stairs to allow chest opening (#268)

src/main/java/appeng/block/AEBaseStairBlock.java

@@ -22,6 +22,12 @@ package appeng.block;
 import com.google.common.base.Preconditions;
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockStairs;
+import net.minecraft.block.state.IBlockState;
+import net.minecraft.util.EnumFacing;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.IBlockAccess;
+
+import javax.annotation.Nonnull;
 
 
 public abstract class AEBaseStairBlock extends BlockStairs {
@@ -43,4 +49,9 @@ public abstract class AEBaseStairBlock extends BlockStairs {
         return this.getClass().getSimpleName() + "[" + regName + "]";
     }
 
+    @Override
+    public boolean doesSideBlockChestOpening(@Nonnull IBlockState blockState, @Nonnull IBlockAccess world, @Nonnull BlockPos pos, @Nonnull EnumFacing side) {
+        return false;
+    }
+
 }