fixup! test(ci): add changelog job that runs cargo xtask changelog

Author: ErichDonGubler

xtask/src/changelog.rs

@@ -96,7 +96,11 @@ fn hunks_in_a_released_section<'a>(changelog_contents: &str, diff: &'a str) -> V
         + changelog_lines.position(|l| l.starts_with("## ")).unwrap() as u64;
 
     let hunks = {
-        let first_hunk_idx = diff.match_indices("\n@@").next().unwrap().0;
+        let first_hunk_match = diff.match_indices("\n@@").next();
+        let Some((first_hunk_idx, _)) = first_hunk_match else {
+            log::info!("no diff found");
+            return vec![];
+        };
         SplitPrefixInclusive::new("\n@@", &diff[first_hunk_idx..]).map(|s| &s['\n'.len_utf8()..])
     };
     let hunks_in_a_released_section = hunks