revert

Author: mzuenni

bin/problem.py

@@ -787,6 +787,12 @@ def testcases(
                 if not t.out_path.is_file():
                     p._warn_once(t.name, f"Found input file {f} without a .out file. Skipping.")
                     continue
+            if mode == validate.Mode.VALID_OUTPUT:
+                if t.out_path is None:
+                    continue
+                if not t.out_path.is_file():
+                    warn(f"Found input file {f} without a .out file. Skipping.")
+                    continue
             testcases.append(t)
         testcases.sort(key=lambda t: t.name)