[Charts] Data Legend Value Mode sample is broken

[MarielaTihova]

1. Go to this sample: https://staging.infragistics.com/blazor-client/charts/financial-chart/data-legend
2. On load we see this console error and no chart is shown

NOTE: The same happens in these samples too:

• https://staging.infragistics.com/blazor-client/charts/financial-chart/data-tooltip
• https://staging.infragistics.com/blazor-client/charts/financial-chart/data-tooltip-formatting-currency