filter out empty blocks in simplifyIfs

1 files changed, 3 insertions, 1 deletions

diff --git a/tools/js-optimizer.js b/tools/js-optimizer.js
index 7900044a..76d33f89 100644
--- a/tools/js-optimizer.js
+++ b/tools/js-optimizer.js
@@ -831,7 +831,9 @@ function simplifyIfs(ast) {
     if (type === 'if' && !node[3]) {
       var body = node[2];
       // recurse to handle chains
-      while (body[0] === 'block' && body[1].length === 1) {
+      while (body[0] === 'block') {
+        if (body[1].length > 1) body[1] = filterEmptyNodes(body[1]);
+        if (body[1].length !== 1) break;
         var singleton = body[1][0];
         if (singleton[0] === 'if' && !singleton[3]) {
           node[1] = ['conditional', node[1], singleton[1], ['num', 0]];