Remove CantRender, it was unused.

src/renderer/renderer.rs

@@ -181,7 +181,8 @@ impl<'a> DustRenderer<'a> {
                     let injected_context = ParametersContext::new(breadcrumbs, &partial.params);
                     let mut new_breadcrumbs = breadcrumbs.clone();
                     new_breadcrumbs.insert(new_breadcrumbs.len() - 1, &injected_context);
-                    let rendered_content = self.render(&partial.name, &new_breadcrumbs)?;
+                    // TODO: Change unwrap to ?
+                    let rendered_content = self.render(&partial.name, &new_breadcrumbs).unwrap();
                     return Ok(rendered_content);
                 }
             }
@@ -291,7 +292,7 @@ mod tests {
     impl<I: ContextElement> Renderable for HashMap<&str, I> {
         fn render(&self, _filters: &Vec<Filter>) -> Result<String, RenderError> {
             // TODO: handle the filters
-            Err(RenderError::CantRender { elem: self })
+            Ok("[object Object]".to_owned())
         }
     }