Fix #49278: SoapClient::__getLastResponseHeaders returns NULL if wsdl operation !has output #12609
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Fixes https://bugs.php.net/bug.php?id=49278
Instead of early exiting, process the headers if tracing is enabled, and exit after that.
I have two commits to make review easier: one that fixes the bug, and one that fixes the indentation because of the if check I added.