Improve pretty print handling of string

If the API response is a JSON string (eg. it only returns an IP as a string like `"192.168.1.1"`) then this will now be able to gracefully handle that instead of dying from an uncaught JSON parse exception.

Author: apm963

utils/index.js

@@ -4,7 +4,12 @@ const path = require('path');
 module.exports = {
   prettyPrint: function(output) {
     if (typeof output === 'string' || output instanceof String) {
-      output = JSON.parse(output);
+      try {
+        output = JSON.parse(output);
+      }
+      catch (err) {
+        // Do nothing; it may have already been parsed (if the JSON was a string and not an object)
+      }
     }
     return JSON.stringify(output, null, 2);
   },