RemoteGalyleo.getFilteredRows should return an empty list on a http error

[rickmcgeer]

We can get a spurious 400 on this, particularly if (as is the case with Google App Engine) the server is slow to respond. Therefore, what we need to do is catch the error in getFilteredRows and return a blank array in the case of an error.

[rickmcgeer]

Now fixed. In RemoteGalyleoTable.getFilteredRows, the code

  return await urlFetcher.readJson();

is now:

  try {
      return await urlFetcher.readJson();
    } catch (error) {
      return [];
    }

See:

$world.execCommand("open browser", {moduleName: "galyleo-data/galyleo-data.js", packageName: "galyleo-dashboard", codeEntity: [{"name":"RemoteGalyleoTable","type":"class-decl"},{"name":"getFilteredRows","type":"class-instance-method"}]});

Fix was done on branch factored-dashboard, will merge when factored-dashboard is merged
Assigning to @merryman for review