Add a note in case nobody submits a CfP issue

Author: phil-opp

content/this-month/2021-04/index.md

@@ -114,16 +114,22 @@ The `spinning_top` crate provides a simple spinlock implementation based on the
 Want to contribute to a Rust OSDev project, but don't know where to start? Pick up one of these outstanding
 issues in one of our projects and get started!
 
-If you maintain a Rust OSDev project and are looking for contributors, especially for tasks suited to people
-getting started in this space, please [create a PR](https://github.com/rust-osdev/homepage/pulls) against the
-`next` branch with the tasks you want to include in the next issue.
-
 <!--
 Please use the following template for adding items:
 
 - [(`repo_name`) Issue Description](https://example.com/link-to-issue)
 -->
 
+<span class="gray">
+
+_No tasks were proposed for this section._
+
+</span>
+
+If you maintain a Rust OSDev project and are looking for contributors, especially for tasks suited to people
+getting started in this space, please [create a PR](https://github.com/rust-osdev/homepage/pulls) against the
+`next` branch with the tasks you want to include in the next issue.
+
 ## Personal Projects
 
 In this section, we describe updates to personal projects that are not directly related to the `rust-osdev` organization. Feel free to [create a pull request](https://github.com/rust-osdev/homepage/pulls) with the updates of your OS project for the next post.