Fix crash when knownGlitches is undefined

Not sure exactly when in the flow this happens! But spooky! Don't crash!

src/app/WardrobePage/OutfitControls.js

@@ -307,7 +307,7 @@ function OutfitKnownGlitchesBadge({ appearance }) {
   // Look for items with the OFFICIAL_SVG_IS_INCORRECT glitch.
   for (const item of appearance.items) {
     const itemHasOfficialSvgIsIncorrect = item.appearance.layers.some((l) =>
-      l.knownGlitches.includes("OFFICIAL_SVG_IS_INCORRECT")
+      (l.knownGlitches || []).includes("OFFICIAL_SVG_IS_INCORRECT")
     );
     if (itemHasOfficialSvgIsIncorrect) {
       glitchMessages.push(

src/app/components/HTML5Badge.js

@@ -138,7 +138,7 @@ export function layerUsesHTML5(layer) {
     layer.canvasMovieLibraryUrl ||
     // If this glitch is applied, then `svgUrl` will be null, but there's still
     // an HTML5 manifest that the official player can render.
-    layer.knownGlitches.includes("OFFICIAL_SVG_IS_INCORRECT")
+    (layer.knownGlitches || []).includes("OFFICIAL_SVG_IS_INCORRECT")
   );
 }