fix corner case in AST_For.init (#1652)

Enforce `null` as value for empty initialisation blocks. fixes #1648
2017-03-24 19:31:17 +08:00
parent 0432a7abb9
commit ac51d4c5a0
3 changed files with 20 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2327,6 +2327,7 @@ merge(Compressor.prototype, {
    };

    OPT(AST_For, function(self, compressor){
+        if (is_empty(self.init)) self.init = null;
        if (!compressor.option("loops")) return self;
        if (self.condition) {
            var cond = self.condition.evaluate(compressor);