maybe a bit late but still. i had this same issue & searched the source code for this (because it used to be: pointdot: false which isn't working anymore)

there are 2 ways of doing this now:

  1. use the options (this is in the documentation nnick.github chartjs & search for point.radius)

    options: { elements: { point: { radius: 1, hitradius: 1, hoverradius: 4 } } }

  2. use the property from the line dataset itself

        data: {                
            datasets: [{
                radius: 0,

small remark: when using radius: 0 it's hard to find the point when mouseover

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