fix(tests): try to fix non-determinism for `test_sync_no_delete_main_…

…branch`

git-branchless/tests/test_sync.rs

@@ -14,6 +14,11 @@ fn remove_nondeterministic_lines(output: String) -> String {
                 // don't understand how it would only sometimes print this
                 // message, but it does.
                 && !line.contains("Switched to branch")
+                // There are weird non-deterministic failures for test
+                // `test_sync_no_delete_main_branch` where an extra newline is
+                // printed, such as in
+                // https://github.com/arxanas/git-branchless/actions/runs/5609690113/jobs/10263760651?pr=1002
+                && !line.is_empty()
         })
         .map(|line| format!("{line}\n"))
         .collect()