do not require ds100 codes in API responses

these are not present when other hafas backends than the DB one were
used for the trip's checkin.

2 files changed, 4 insertions, 4 deletions

diff --git a/src/onboard/iceportal.rs b/src/onboard/iceportal.rs
index bde0b1f..55b35e7 100644
--- a/src/onboard/iceportal.rs
+++ b/src/onboard/iceportal.rs
@@ -75,8 +75,8 @@ impl IsStation for Stop {
     self.timetable.scheduled_arrival_time.as_ref()
   }
 
-  fn ds100(&self) -> &str {
-    "??"
+  fn ds100(&self) -> Option<&str> {
+    None
   }
 }
 
diff --git a/src/onboard/zugportal.rs b/src/onboard/zugportal.rs
index c649107..fe083ef 100644
--- a/src/onboard/zugportal.rs
+++ b/src/onboard/zugportal.rs
@@ -67,8 +67,8 @@ impl IsStation for Stop {
     self.arrival_time.as_ref().map(|t| &t.predicted)
   }
 
-  fn ds100(&self) -> &str {
-    "??"
+  fn ds100(&self) -> Option<&str> {
+    None
   }
 }