Adding NotFound error type.

src/renderer/renderer.rs

@@ -212,6 +212,13 @@ fn new_walk_path<'a>(
     breadcrumbs: Vec<&'a dyn ContextElement>,
     path: &Vec<&str>,
 ) -> Result<&'a dyn ContextElement, RenderError<'a>> {
+    for context in breadcrumbs.iter().rev() {
+        match walk_path_from_single_level(*context, path)? {
+            WalkResult::NoWalk => {}
+            WalkResult::PartialWalk => {}
+            WalkResult::FullyWalked(_) => {}
+        }
+    }
     Err(RenderError::Generic("temp".to_owned()))
 }