[Qt-interest] Calling member functions of potentially null QDomElements

[Ellen Kestrel]

Is it safe to call member functions of QDomElements which might be null?
The documentation states that some functions may return "null" QDomElements
in certain circumstances (e.g. QDomNode::toElement () if the node is not an
element, or QDomElement::firstChildElement (QString tagName) if no such
child exists).

For example, is it safe to do this:

QString text = domNode.firstChildElement ("mytag").text ();

or should I be breaking this statement into two lines and adding a check to
QDomNode::isNull ()?  I would expect that the call above would simply result
in a return value of "" if there isn't a child node with the "mytag" tag,
but I just wanted to check.

- EK
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