fix errors on non-existing build dir

src/render/combinators.rs

@@ -0,0 +1,26 @@
+use super::{Format, Render};
+use crate::component::Component;
+use std::path::Component;
+
+pub trait RenderExt<W>: Render<W> + Sized
+where
+    W: Format + ?Sized,
+{
+    fn then<R>(self, next: R) -> Then<Self, R>
+    where
+        R: Render<W>;
+}
+
+#[derive(Debug, Clone)]
+pub struct Then<R, S> {
+    first: R,
+    second: S,
+}
+
+impl<R, S> Component for Then<R, S>
+where
+    R: Component,
+    S: Component<Kind = R::Kind>,
+{
+    type Kind = R::Kind;
+}

src/site.rs

@@ -118,10 +118,8 @@ where
         let source = resource_dir;
         let mut internal_path = InternalPath::default();
 
-        fs::remove_dir_all(&dest).map_err(|cause| BuildError {
-            path: internal_path.clone(),
-            cause,
-        })?;
+        let _ = fs::remove_dir_all(&dest)
+            .map_err(|cause| BuildError { path: internal_path.clone(), cause });
 
         let mut operations =
             vec![Operation::Build(Entry::Directory(&self.root))];