Render amenity=bicycle_rental ref if it has no name

[gszy]

Some bike rental networks have their pickup points identified by some number, but without any name or description. If I understand the current code correctly…

cyclosm-cartocss-style/amenities.mss

Lines 1376 to 1387 in 01a7a53

	[feature = 'amenity_bicycle_rental'][zoom >= 18] {
	text-name: "[name]";
	text-size: @standard-font-size;
	text-wrap-width: @standard-wrap-width;
	text-line-spacing: @standard-line-spacing-size;
	text-fill: @bicycle-rental;
	text-dy: 10;
	text-face-name: @standard-font;
	text-halo-radius: @standard-halo-radius;
	text-halo-fill: @standard-halo-fill;
	text-placement: interior;
	}

…it seems there are no labels for nodes without the name tag on CyclOSM. Could you add ref as a fallback in case there’s no name?