--- Comment #1 from Jonathan Druart <> 
Created attachment 73801
Bug 20540: Fix TransformHtmlToXml if last tag is empty

This bug has been found during testing bug 19289.

In some conditions C4::Biblio::TransformHtmlToXml will generate a malformed XML
structure. The last </datafield> can be duplicated.

For instance, if a call like:
my $xml = TransformHtmlToXml( \@tags, \@subfields, \@field_values );

with the last value of @field_values is empty, it will return:

<?xml version="1.0" encoding="UTF-8"?>
<datafield2 tag="020" ind1=" " ind2=" ">
<subfield code="a">l</subfield>
<datafield1 tag="100" ind1=" " ind2=" ">
<subfield code="a">k</subfield>
<datafield1 tag="245" ind1=" " ind2=" ">
<subfield code="a">k</subfield>
<datafield1 tag="250" ind1=" " ind2=" ">
<subfield code="a">k</subfield>
<datafield1 tag="260" ind1=" " ind2=" ">
<subfield code="b">k</subfield>
<subfield code="c">k</subfield>

Which will result later in the following error:
:23: parser error : Opening and ending tag mismatch: record line 6 and
:24: parser error : Opening and ending tag mismatch: collection line 2 and
:25: parser error : Extra content at the end of the document

Test plan:
You can test it along with bug 19289 and confirm that it fixes the problem
raised on bug 19289 comment 30

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