BUGFIX: Augmentations page crashes after grafting an aug if player has not installed any augs

[catloversg]

MRE:

• Load a clean save file.
• Set SF4 and SF10.
• Run the test code and switch to the Augmentations page immediately.

When the player has no installed augs, selectedAug is undefined. InstalledAugmentations is rerendered every cycle. After finishing grafting the first aug, sourceAugs contains 1 aug, so the sourceAugs.length > 0 block is rendered, but selectedAug is undefined, so it crashes at selectedAug.name.

Test code:

/** @param {NS} ns */
export async function main(ns) {
  Player.augmentations.length = 0;
  Player.queuedAugmentations.length = 0;
  Player.money = 1e100;
  ns.singularity.travelToCity("New Tokyo");
  ns.grafting.graftAugmentation("Augmented Targeting I", false);
  await ns.sleep(3000);
  Player.processWork(1e6);
}