Change `append` to `optAppend` for headers and data to avoid `NullPointerException`
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@ -42,8 +42,8 @@ public abstract class AbstractHttpOverXmpp extends IQ {
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protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder xml) {
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IQChildElementXmlStringBuilder builder = getIQHoxtChildElementBuilder(xml);
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builder.append(headers.toXML());
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builder.append(data.toXML());
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builder.optAppend(headers.toXML());
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builder.optAppend(data.toXML());
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return builder;
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}
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