check_pgsql: Fixed query perfdata output for empty warn/crit ranges.

Previously, "(null)" was printed (when using GNU's libc). This has been
changed to print the empty string instead.

1 files changed, 3 insertions, 1 deletions

diff --git a/plugins/check_pgsql.c b/plugins/check_pgsql.c
index edad116a..2acddc4f 100644
--- a/plugins/check_pgsql.c
+++ b/plugins/check_pgsql.c
@@ -578,7 +578,9 @@ do_query (PGconn *conn, char *query)
                                                 ? _("CRITICAL")
                                                 : _("UNKNOWN"));
         printf (_("'%s' returned %f"), query, value);
-        printf ("|query=%f;%s;%s;0\n", value, query_warning, query_critical);
+        printf ("|query=%f;%s;%s;0\n", value,
+                        query_warning ? query_warning : "",
+                        query_critical ? query_critical : "");
         return my_status;
 }