Empty stack error in openXML filter

Original [issue 81](https://code.google.com/p/okapi/issues/detail?id=81) created by @ysavourel on 2009-07-07T16:13:19.000Z:

When doing a text rewrite (or even a simple extraction without rewrite) on the attached document, I get:

@ java.util.EmptyStackException java.util.EmptyStackException at java.util.Stack.peek(Unknown Source) at java.util.Stack.pop(Unknown Source) at net.sf.okapi.filters.markupfilter.ExtractionRuleState.popTextUnitRule (Unknown Source) at net.sf.okapi.filters.openxml.OpenXMLContentFilter.handleEndTag (Unknown Source) at net.sf.okapi.filters.markupfilter.AbstractBaseMarkupFilter.next (Unknown Source) at net.sf.okapi.filters.openxml.OpenXMLFilter.nextInSubDocument (Unknown Source) at net.sf.okapi.filters.openxml.OpenXMLFilter.next(Unknown Source) at net.sf.okapi.applications.rainbow.utilities.BaseFilterDrivenUtility.process FilterInput(Unknown Source) at net.sf.okapi.applications.rainbow.UtilityDriver.execute(Unknown Source) at net.sf.okapi.applications.rainbow.MainForm.launchUtility (Unknown Source) at net.sf.okapi.applications.rainbow.MainForm.access$5400(Unknown Source) at net.sf.okapi.applications.rainbow.MainForm$75.widgetSelected (Unknown Source) at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source) at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source) at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source) at net.sf.okapi.applications.rainbow.MainForm.run(Unknown Source) at net.sf.okapi.applications.rainbow.Main.main(Unknown Source)

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