[OpenXML] XLSX: Markup writing failed

[Iverson Pereira]

From the version 1.43.0 some .xlsx files are with this issue in the merging of file.

java.lang.IllegalStateException: Markup writing failed
    at net.sf.okapi.filters.openxml.MarkupZipSkeleton.getModifiedContents(MarkupZipSkeleton.java:65) ~[okapi-filter-openxml-1.43.0.jar:na]
    at net.sf.okapi.filters.openxml.OpenXMLFilterWriter.processDocumentPart(OpenXMLFilterWriter.java:397) ~[okapi-filter-openxml-1.43.0.jar:na]
    at net.sf.okapi.filters.openxml.OpenXMLFilterWriter.handleEvent(OpenXMLFilterWriter.java:238) ~[okapi-filter-openxml-1.43.0.jar:na]
    at net.sf.okapi.steps.common.FilterEventsWriterStep.handleEvent(FilterEventsWriterStep.java:194) ~[okapi-step-common-1.43.0.jar:na]
    at net.sf.okapi.common.pipeline.Pipeline.execute(Pipeline.java:117) ~[okapi-core-1.43.0.jar:na]
    at net.sf.okapi.common.pipeline.Pipeline.process(Pipeline.java:227) ~[okapi-core-1.43.0.jar:na]
    at net.sf.okapi.common.pipeline.Pipeline.process(Pipeline.java:199) ~[okapi-core-1.43.0.jar:na]

javax.xml.stream.XMLStreamException: Trying to output second root, <dxf>

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