Fix.

node_modules/handlebars/lib/handlebars/helpers/block-helper-missing.js

@@ -0,0 +1,32 @@
+import {appendContextPath, createFrame, isArray} from '../utils';
+
+export default function(instance) {
+  instance.registerHelper('blockHelperMissing', function(context, options) {
+    let inverse = options.inverse,
+        fn = options.fn;
+
+    if (context === true) {
+      return fn(this);
+    } else if (context === false || context == null) {
+      return inverse(this);
+    } else if (isArray(context)) {
+      if (context.length > 0) {
+        if (options.ids) {
+          options.ids = [options.name];
+        }
+
+        return instance.helpers.each(context, options);
+      } else {
+        return inverse(this);
+      }
+    } else {
+      if (options.data && options.ids) {
+        let data = createFrame(options.data);
+        data.contextPath = appendContextPath(options.data.contextPath, options.name);
+        options = {data: data};
+      }
+
+      return fn(context, options);
+    }
+  });
+}