Always parse dependencies if babel ran. Fixes #408.

A babel plugin might introduce a new dependency, e.g. transform-runtime.

Author: devongovett

src/assets/JSAsset.js

@@ -30,6 +30,7 @@ class JSAsset extends Asset {
 
   mightHaveDependencies() {
     return (
+      this.isAstDirty ||
       !/.js$/.test(this.name) ||
       IMPORT_RE.test(this.contents) ||
       GLOBAL_RE.test(this.contents) ||