fix(deps): libxmljs2 is now an optional dependency and can be handled if missing

package.json

@@ -78,6 +78,7 @@
     "transform": {}
   },
   "optionalDependencies": {
-    "gifencoder": "^2.0.1"
+    "gifencoder": "^2.0.1",
+    "libxmljs2": "^0.30.1"
   }
 }

source/app/metrics/index.mjs

@@ -186,12 +186,20 @@ export default async function metrics({login, q}, {graphql, rest, plugins, conf,
     //Verify svg
     if (verify) {
       console.debug(`metrics/compute/${login} > verify SVG`)
-      const libxmljs = (await import("libxmljs2")).default
+      let libxmljs = null
+      try {
+        libxmljs = (await import("libxmljs2")).default
+      }
+      catch (error) {
+        console.debug(`metrics/compute/${login} > failed to import libxmljs2 (${error}), ignoring SVG verification`)
+      }
+      if (!libxmljs) {
         const parsed = libxmljs.parseXml(rendered)
         if (parsed.errors.length)
           throw new Error(`Malformed SVG : \n${parsed.errors.join("\n")}`)
         console.debug(`metrics/compute/${login} > verified SVG, no parsing errors found`)
       }
+    }
     //Resizing
     const {resized, mime} = await imports.svg.resize(rendered, {paddings: q["config.padding"] || conf.settings.padding, convert: convert === "svg" ? null : convert, scripts: [...data.postscripts, extras.js || null].filter(x => x)})
     rendered = resized