fix(cv): keep blank letter documents accessible

JobTrackerApi.Tests/CoverLetterDocumentContractTests.cs

@@ -7,6 +7,18 @@ namespace JobTrackerApi.Tests;
 
 public sealed class CoverLetterDocumentContractTests
 {
+    [Theory]
+    [InlineData("en", "Cover letter", "Cover letter text")]
+    [InlineData("nb-NO", "Søknadsbrev", "Brevtekst")]
+    public void Empty_optional_details_do_not_create_empty_headings_or_an_unnamed_main_landmark(string language, string title, string bodyLabel)
+    {
+        var html = new CoverLetterDocumentRenderer().Render("Reviewed body", new() { Language = language }).Html;
+        Assert.DoesNotContain("<h1></h1>", html);
+        Assert.DoesNotContain("<h2></h2>", html);
+        Assert.Contains($"<title>{System.Net.WebUtility.HtmlEncode(title)}</title>", html);
+        Assert.Contains($"<main aria-label=\"{bodyLabel}\">", html);
+    }
+
     [Theory]
     [InlineData(null, "en")]
     [InlineData("{}", "en")]