From b338c75c28409bc49057273c6cdf6cd58b1bf68d Mon Sep 17 00:00:00 2001
From: Andrew Clark <acdlite@fb.com>
Date: Fri, 3 Feb 2017 15:37:30 -0800
Subject: [PATCH] Get rid of DEV only invariant

---
 src/renderers/shared/fiber/ReactChildFiber.js | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/src/renderers/shared/fiber/ReactChildFiber.js b/src/renderers/shared/fiber/ReactChildFiber.js
index 4320df60ea..c48371a9c7 100644
--- a/src/renderers/shared/fiber/ReactChildFiber.js
+++ b/src/renderers/shared/fiber/ReactChildFiber.js
@@ -806,15 +806,13 @@ function ChildReconciler(shouldClone, shouldTrackSideEffects) {
       // First, validate keys.
       // We'll get a different iterator later for the main pass.
       const newChildren = iteratorFn.call(newChildrenIterable);
-      invariant(
-        newChildren != null,
-        'An iterable object provided no iterator.'
-      );
-      let knownKeys = null;
-      let step = newChildren.next();
-      for (; !step.done; step = newChildren.next()) {
-        const child = step.value;
-        knownKeys = warnOnDuplicateKey(child, knownKeys);
+      if (newChildren) {
+        let knownKeys = null;
+        let step = newChildren.next();
+        for (; !step.done; step = newChildren.next()) {
+          const child = step.value;
+          knownKeys = warnOnDuplicateKey(child, knownKeys);
+        }
       }
     }