Fix resolving sass files

Author: CompuIves

packages/app/src/sandbox/eval/transpilers/sass/worker/sass-worker.js

@@ -119,18 +119,11 @@ const resolveSass = (fs, p, path) => {
         extensions: ['.scss', '.css', '.sass'],
         moduleDirectory: ['node_modules'],
         packageFilter,
-        isFile: async (pp, cb) => {
+        isFile: async (pp, c, cb) => {
           const exists = !!(await getExistingPath(fs, pp));
+          const callback = c || cb;
 
-          if (!exists) {
-            const err = new Error('Could not find ' + pp);
-            // $FlowIssue
-            err.code = 'ENOENT';
-
-            return cb(err);
-          }
-
-          return cb(null, exists);
+          return callback(null, exists);
         },
         readFile: async (pp, encoding, cb) => {
           const foundPath = await getExistingPath(fs, pp);