Fix empty body for NodeJS functions

docker/runtime/nodejs/kubeless.js

@@ -75,7 +75,9 @@ function modExecute(handler, req, res, end) {
             'event-id': req.get('event-id'),
             'event-time': req.get('event-time'),
             'event-namespace': req.get('event-namespace'),
-            'data': (req.get('content-type') === 'application/json') ? JSON.parse(req.body.toString('utf-8')) : req.body.toString('utf-8'),
+            'data': (req.get('content-type') === 'application/json' && req.body.length > 0)
+              ? JSON.parse(req.body.toString('utf-8'))
+              : req.body.toString('utf-8'),
             'extensions': { request: req },
         };
         Promise.resolve(func(event, context))

kubeless.jsonnet

@@ -111,13 +111,13 @@ local runtime_images ='[
       {
         "name": "node6",
         "version": "6",
-        "runtimeImage": "kubeless/nodejs@sha256:37d496adee0896a4a192f7116d8075ae88ee14b1a3c41974d79609e0863ae464",
+        "runtimeImage": "kubeless/nodejs@sha256:12a767ba23a54daad0c187bc192d97371df863e8ccc6438ad60d81c9acd84309",
         "initImage": "node:6.10"
       },
       {
         "name": "node8",
         "version": "8",
-        "runtimeImage": "kubeless/nodejs@sha256:4327d0f7781463a8b0a843000592c2c0df17988662b38b33dbb35b1bdd5ccc2b",
+        "runtimeImage": "kubeless/nodejs@sha256:1544aab7a31dab207882a6e7214465400bf3d26838d8a7ac631e74b87aeff006",
         "initImage": "node:8"
       }
     ],