fix(collector): prevent empty AU results from blocking API startup

scripts/check_african_union_collector.py

@@ -30,7 +30,11 @@ async def main() -> None:
 
     opportunities = await collector.collect()
     if not opportunities:
-        raise RuntimeError("African Union returned no current opportunity.")
+        print(
+            "[collector-check] African Union returned no current "
+            "opportunity. The API can continue normally."
+        )
+        return
 
     for opportunity in opportunities:
         payload = serialize_value(asdict(opportunity))