Fixed broken SVGA option.

docs/CHANGES.md

@@ -7,6 +7,7 @@
 - New meta initialisation options, `dosee:speed`, `dosee:graphic` and `dosee:audio`.
 - Renamed Hardware tab headers to improve their clarity.
 - Replaced two of the sample demos to better show off the variety of emulated hardware.
+- Fixed broken SVGA Graphic option, `dosmachine=svga`.
 
 ### v1.60
 

src/js/dosee-loader.js

@@ -271,8 +271,10 @@ window.Module = null;
       if (loadConfig === ``)
         throw Error(`graphicMode loadConfig argument cannot be empty`);
       const alerts = () => {
-        document.getElementById(`svgaEffectsMsg`).classList.add(`hidden`);
-        document.getElementById(`highResRequired`).classList.remove(`hidden`);
+        const s = document.getElementById(`svgaEffectsMsg`);
+        if (s !== null) s.classList.add(`hidden`);
+        const h = document.getElementById(`highResRequired`);
+        if (h !== null) h.classList.remove(`hidden`);
       };
       // emulation graphics or machine type
       const machine =