api: check if name/desc/algo are NULL and fill with defaults if so.

Defaults should probably be specified elsewhere.
There should be a constructor for stuff like this.
This shit is really bringing me down.

api.c

@@ -2178,6 +2178,11 @@ static void addpool(struct io_data *io_data, __maybe_unused SOCKETTYPE c, char *
 		return;
 	}
 
+	/* If API client is old, it might not have provided all fields. */
+	if (name == NULL) name = strdup("");
+	if (desc == NULL) desc = strdup("");
+	if (algo == NULL) algo = strdup("scrypt");  // FIXME?
+
 	pool = add_pool();
 	detect_stratum(pool, url);
 	add_pool_details(pool, true, url, user, pass, name, desc, algo);