BUG: Fix bug found by Di when dealing with text nodes in XML.
The code to deal with "Content" stored in XML Text Nodes was previously rewritten to avoid use of xmlNodeGetContent() which recursively combines all children node contents to the content of the current node, which was undesired behavior. I was rewritten to find the first text node and return the content of that node, but this was insufficient as sometimes the first text node is whitespace. The code now finds the first text node containing content, which works for all Xdmf and NetDMF files we have come across.
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