ARC: For signing, accept A-R header lacking ARC info as equivalent to "none"

diff --git a/src/src/arc.c b/src/src/arc.c
index a0e2184bddc513bec500b644ce11ba51b6f2a49c..f4ae096bc26731a6dbd15eb19dcb15392c59c75b 100644 (file)
--- a/src/src/arc.c
+++ b/src/src/arc.c
@@ -1375,7 +1375,7 @@ while ((methodspec = string_nextinlist(&resinfo, &sep, NULL, 0)))
          (c = *s) && c != ';' && c != ' ' && c != '\r' && c != '\n'; ) s++;
     return string_copyn(methodspec, s - methodspec);
     }
-return NULL;
+return US"none";
 }