Fixed issue where dashboard crashes when double marked with config is infinite or NaN

[Eeshwar-Krishnan]

someone had this issue thought I would pr it lol

[rbrott]

Nice, this is indeed a common issue. This minimal patch gets the job done but doesn't really fit with my general philosophy of surfacing errors directly instead of silently proceeding. I'd prefer a change like one of the following (in order of increasing effort).

• Catch the error thrown by Gson and throw a new exception with a more instructive error message.
• Flag invalid values and display a per-variable message in lieu of edit controls.
• Extend controls to support special float values and transmit them faithfully (boxing if necessary).