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Fix feature remove NPE.
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@ -46,6 +46,7 @@ class RemoveFeatureFromTopicCommand extends Command {
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execute(commandContext: CommandContext): void {
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const topic = commandContext.findTopics([this._topicId])[0];
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const feature = topic.findFeatureById(this._featureId);
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this._oldFeature = feature;
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topic.removeFeature(feature);
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}
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