heatmap always shows markers

[mrjones-plip]

if you remove the markers section to maptable that has a heatmap section, it still shows the marks. the current work around is to have your markers stanza look like this:

                markers: {
                    attr: {
                        r: {
                            min: "minValue",
                            max: "maxValue",
                            transform: function(v) {
                                return 0;
                            },
                            rollup: function(values) {
                                return 0;
                            },
                        },
                    },
                },

which effectively returns all markers as null. however, the default maptable behavior of excluding this stanza causing the markers to be hidden would be mo bettah.

[mrjones-plip]

fixed and merged!