error when using first column as defaultSorting

[mrjones-plip]

if you have a table() section on your maptable that has a defaultSorting which references the first column of csv data, you get an error:

TypeError: d3.event is null Table.js:206:11

This references this if statement:

if (!d3.event.shiftKey) {
    this.sorting = [this.sorting[sortIndex]];
}

To reproduce, change city to country in the default.sort.html example:

defaultSorting: {
    key: "country"
}

current work around is re-order the data source to not have first column be the one you want to sort on

[melalj]

@Ths2-9Y-LqJt6 Should be fixed with #81 !