The issue is the viewWindowMode option.  When set to 'maximized' it tries to 
set up the chart with the maximum and minimum values touching the top and 
bottom of the chart area.  If all values are the same, however, it cannot do 
so.  Try this instead:

vAxis: {
    textPosition: 'none',
    gridlineColor: '#FFFFFF',
    baseline: 0,
    minValue: 0,
    maxValue: 10,
    baselineColor: '#FFFFFF',
    viewWindow: {
        min: 0,
        max: 10
    }
}

Incidentally, the viewWindowMode option is not used for hAxis in Line 
Charts.

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