run_command: catch all exceptions

egrader/plugins/repo.py

@@ -1,6 +1,7 @@
 """Repository plug-ins."""
 
 import shlex
+import sys
 from datetime import date, datetime
 from pathlib import Path
 from subprocess import TimeoutExpired, run
@@ -116,6 +117,14 @@ def assess_run_command(
     except (TimeoutExpired, FileNotFoundError):
         return 0
 
+    except Exception as ex:
+        print(
+            f"Unexpected error '{ex}' running command '{command}' in "
+            + "folder '{repo_path}'",
+            file=sys.stderr,
+        )
+        return 0
+
     if expect_exit_code != r.returncode:
         return 0