Don't override askAnswered when defined. (#1247)

Author: mshima

lib/index.js

@@ -497,7 +497,9 @@ class Generator extends EventEmitter {
 
     // Shows the prompt even if the answer already exists.
     questions.forEach(question => {
-      question.askAnswered = this.options.askAnswered === true;
+      if (question.askAnswered === undefined) {
+        question.askAnswered = this.options.askAnswered === true;
+      }
     });
 
     // Pre-fill answers with storage values.