OpenXML Filter: crashes with empty paragraph levels in PPTX notes styles

at net.sf.okapi.filters.openxml.PresentationNotesStyleDefinitions.getParagraphLevelProperties(PresentationNotesStyleDefinitions.java:70)
    at net.sf.okapi.filters.openxml.PresentationNotesStyleDefinitions.getCombinedRunProperties(PresentationNotesStyleDefinitions.java:62)
    at net.sf.okapi.filters.openxml.BlockParser.clarifyVisibility(BlockParser.java:227)
    at net.sf.okapi.filters.openxml.BlockParser.processRun(BlockParser.java:213)
    at net.sf.okapi.filters.openxml.BlockParser.parse(BlockParser.java:142)
    at net.sf.okapi.filters.openxml.StyledTextPartHandler.process(StyledTextPartHandler.java:173)
    at net.sf.okapi.filters.openxml.StyledTextPartHandler.open(StyledTextPartHandler.java:145)
    at net.sf.okapi.filters.openxml.StyledTextPartHandler.open(StyledTextPartHandler.java:137)
    at net.sf.okapi.filters.openxml.OpenXMLFilter.nextInZipFile(OpenXMLFilter.java:532)
    at net.sf.okapi.filters.openxml.OpenXMLFilter.next(OpenXMLFilter.java:286)
    at net.sf.okapi.filters.openxml.OpenXMLFilter.next(OpenXMLFilter.java:301)
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