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-rw-r--r--lib/render-msg.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/render-msg.js b/lib/render-msg.js
index 88224f0..5cd6e2d 100644
--- a/lib/render-msg.js
+++ b/lib/render-msg.js
@@ -492,7 +492,7 @@ RenderMsg.prototype.about = function (cb) {
var extras
for (var k in this.c) {
- if (!knownAboutProps[k]) {
+ if (this.c[k] !== null && this.c[k] !== '' && !knownAboutProps[k]) {
if (!extras) extras = {}
extras[k] = this.c[k]
}