Minor changes in sieve.

* libmu_sieve/runtime.c (mu_sieve_abort): Jump with code MU_ERR_FAILURE.
* libmu_sieve/tests.c (retrieve_address): Tolerate empty addresses.
(retrieve_header): Return reasonable error code.
* maidag/script.c (script_apply): If the script failed, return 0.

@@ -157,7 +157,7 @@ _mu_i_sv_instr_brnz (mu_sieve_machine_t mach)
 void
 mu_sieve_abort (mu_sieve_machine_t mach)
 {
-  longjmp (mach->errbuf, 1);
+  longjmp (mach->errbuf, MU_ERR_FAILURE);
 }
 
 void

@@ -67,6 +67,8 @@ retrieve_address (void *item, void *data, size_t idx, char **pval)
       rc = mu_header_aget_value ((mu_header_t)ap->data, (char*)item, &val);
       if (rc)
 	return rc;
+      if (mu_str_skip_class (val, MU_CTYPE_BLANK)[0] == 0)
+	return MU_ERR_NOENT;
       rc = mu_address_create (&ap->addr, val);
       free (val);
       if (rc)
@@ -150,11 +152,7 @@ retrieve_header (void *item, void *data, size_t idx, char **pval)
 	{
 	  int i = hc->index++;
 	  if (mu_c_strcasecmp (hname, (char*)item) == 0)
-	    {
-	      if (mu_header_aget_field_value_unfold (hc->header, i, pval))
-		return -1;
-	      return 0;
-	    }
+	    return mu_header_aget_field_value_unfold (hc->header, i, pval);
 	}
 
       hc->header = NULL;

@@ -98,13 +98,6 @@ apply_script (void *item, void *data)
 
   free (progfile);
 
-  if (rc == 0)
-    {
-      mu_attribute_t attr;
-      mu_message_get_attribute (clos->msg, &attr);
-      rc = mu_attribute_is_deleted (attr);
-    }
-  
   return rc;
 }
   
@@ -129,7 +122,15 @@ script_apply (mu_message_t msg, struct mu_auth_data *auth)
 	  rc = mu_list_foreach (script_list, apply_script, &clos);
 	  chdir ("/");
 	  switch_user_id (auth, 0);
-	}
+	  if (rc == 0)
+	    {
+	      mu_attribute_t attr;
+	      mu_message_get_attribute (msg, &attr);
+	      rc = mu_attribute_is_deleted (attr);
+	    }
+	  else
+	    rc = 0;
+  	}
     }
   return rc;
 }