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util.error: Fix error on conversion of invalid error stanza, fix #1805 Error stanzas should have an <error> element, but if you pass a stanza without one to util.error.from_stanza() it triggers an attempt to index a nil value, which this patch avoids. In the conditional, it should be safe to assume error_tag is non-nil since condition can't have those values then.

{
    "JSON Test Pattern pass3": {
        "The outermost value": "must be an object or array.",
        "In this test": "It is an object."
    }
}