improve log

src/data_source.rs

@@ -70,6 +70,7 @@ pub trait DataSource {
         );
         let data = self.get_champ_data_with_win_pourcentage(champ, positions, client);
 
+        let mut missing_roles = vec![];
         for pos in positions {
             let mut ok = false;
             for build in &data {
@@ -79,14 +80,17 @@ pub trait DataSource {
                 }
             }
             if !ok {
+                missing_roles.push(pos.to_owned());
+            }
+        }
+        if !missing_roles.is_empty() {
             error!(
                 "{}: Can't get data for {} at {}",
                 self.get_alias(),
                 champ.id,
-                    pos
+                missing_roles.join(", ")
             );
         }
-        }
 
         for build in data {
             let item_set = ItemSet {