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Add comment and handle undefined host case.

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This commit is contained in:
Kevin Schaaf
2018-10-31 14:18:22 -07:00
parent 9f65049f76
commit 6e4f62d88b
1 changed files with 3 additions and 1 deletions
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lib/legacy/legacy-data-mixin.html
+3 -1
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@@ -155,10 +155,12 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
Polymer.LegacyDataMixin(superClass)
);
// Apply LegacyDataMixin to Templatizer instances as well, and defer
// runtime switch to the root's host (_methodHost)
Polymer.Templatize.mixin =
Polymer.dedupingMixin(superClass => class extends Polymer.LegacyDataMixin(superClass) {
get _legacyUndefinedCheck() {
return this._methodHost._legacyUndefinedCheck;
return this._methodHost && this._methodHost._legacyUndefinedCheck;
}
});