Fix coverage

src/core/musichoard/musichoard.rs

@@ -954,4 +954,10 @@ mod tests {
         assert_eq!(actual_err, expected_err);
         assert_eq!(actual_err.to_string(), expected_err.to_string());
     }
+
+    #[test]
+    fn empty() {
+        let music_hoard = MusicHoard::empty();
+        assert!(!format!("{music_hoard:?}").is_empty());
+    }
 }

src/core/musichoard/musichoard_builder.rs

@@ -85,7 +85,7 @@ mod tests {
 
     #[test]
     fn no_library_no_database() {
-        MusicHoardBuilder::default();
+        MusicHoardBuilder::default().build();
     }
 
     #[test]