fix clippy errs

src/api.rs

@@ -1142,8 +1142,8 @@ mod tests {
         let months: HashSet<_> = body.iter().map(|r| r.month.as_str()).collect();
         let species: HashSet<_> = body.iter().map(|r| r.species_code.as_str()).collect();
 
-        assert!(months.len() >= 1);
-        assert!(species.len() >= 1);
+        assert!(!months.is_empty());
+        assert!(!species.is_empty());
 
         for row in &body {
             assert!(!row.species_code.is_empty());