[Fix] createStream: result payload is not always an object (#519)

Fixes #519.

lib/results.js

@@ -58,8 +58,10 @@ Results.prototype.createStream = function (opts) {
                 ontest(st, { parent: id });
             });
             t.on('result', function (res) {
-                res.test = id;
-                res.type = 'assert';
+                if (res && typeof res === 'object') {
+                    res.test = id;
+                    res.type = 'assert';
+                }
                 output.queue(res);
             });
             t.on('end', function () {

test/objectMode.js

@@ -47,8 +47,7 @@ tap.test('object results', function (assert) {
         assert.end();
     };
 
-    tape.createStream({ objectMode: true })
-        .pipe(printer);
+    tape.createStream({ objectMode: true }).pipe(printer);
 
     tape('parent', function (t1) {
         t1.equal(true, true);

test/objectModeWithComment.js

@@ -0,0 +1,41 @@
+'use strict';
+
+var tap = require('tap');
+var tape = require('../');
+var through = require('through');
+
+tap.test('test.comment() in objectMode', function (assert) {
+    var printer = through({ objectMode: true });
+    var objects = [];
+    printer.on('error', function (e) {
+        assert.fail(e);
+    });
+
+    printer.write = function (obj) {
+        objects.push(obj);
+    };
+    printer.end = function (obj) {
+        if (obj) { objects.push(obj); }
+
+        assert.equal(objects.length, 3);
+        assert.deepEqual(objects, [
+            {
+                type: 'test',
+                name: 'test.comment',
+                id: 0,
+                skip: false,
+                todo: false
+            },
+            'message',
+            { type: 'end', test: 0 }
+        ]);
+        assert.end();
+    };
+
+    tape.createStream({ objectMode: true }).pipe(printer);
+
+    tape('test.comment', function (test) {
+        test.comment('message');
+        test.end();
+    });
+});