Add guard for fuzzy storage.

src/fuzzy_storage.c

@@ -346,7 +346,7 @@ start_fuzzy (struct rspamd_worker *worker)
 	if ((ctx->backend = rspamd_fuzzy_backend_open (ctx->hashfile, &err)) == NULL) {
 		msg_err ("cannot open backend: %e", err);
 		g_error_free (err);
-		exit (EXIT_FAILURE);
+		exit (EXIT_SUCCESS);
 	}
 
 	server_stat->fuzzy_hashes = rspamd_fuzzy_backend_count (ctx->backend);

src/libserver/fuzzy_backend.c

@@ -391,6 +391,11 @@ rspamd_fuzzy_backend_open (const gchar *path, GError **err)
 			fallback_journal[] = "PRAGMA journal_mode=\"off\";";
 	int rc;
 
+	if (path == NULL) {
+		g_set_error (err, rspamd_fuzzy_backend_quark (),
+				ENOENT, "Path has not been specified");
+		return NULL;
+	}
 	/* First of all we check path for existence */
 	dir = g_path_get_dirname (path);
 	if (dir == NULL) {