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Datatable: Exporter issue with NULL DisplayPriority

See original GitHub issue

@melloware with the revision 572eaeee2c75fa901fb450c503b88d5912aa1ff6 from April 22, 17:39 the datatable exporter is not working anymore. the following NPE is thrown:

java.lang.NullPointerException
	at java.util.Comparator.lambda$comparingInt$7b0bb60$1(Comparator.java:490)
	at java.util.TimSort.countRunAndMakeAscending(TimSort.java:355)
	at java.util.TimSort.sort(TimSort.java:220)
	at java.util.Arrays.sort(Arrays.java:1512)
	at java.util.stream.SortedOps$SizedRefSortingSink.end(SortedOps.java:348)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
	at org.primefaces.component.export.TableExporter.getExportableColumns(TableExporter.java:98)
	at org.primefaces.component.datatable.export.DataTableCSVExporter.addColumnFacets(DataTableCSVExporter.java:111)
	at org.primefaces.component.datatable.export.DataTableCSVExporter.doExport(DataTableCSVExporter.java:73)
	at org.primefaces.component.datatable.export.DataTableExporter$DataTableVisitCallBack.visit(DataTableExporter.java:250)
	at com.sun.faces.component.visit.FullVisitContext.invokeVisitCallback(FullVisitContext.java:127)
	at org.primefaces.component.api.UIData.visitTree(UIData.java:691)
	at org.primefaces.component.datatable.export.DataTableExporter$DataTableVisitCallBack.lambda$invoke$0(DataTableExporter.java:269)
	at org.primefaces.util.ComponentUtils.invokeOnClosestIteratorParent(ComponentUtils.java:546)
	at org.primefaces.component.datatable.export.DataTableExporter$DataTableVisitCallBack.invoke(DataTableExporter.java:267)
	at org.primefaces.component.datatable.export.DataTableExporter.export(DataTableExporter.java:211)
	at org.primefaces.component.export.DataExporter.processAction(DataExporter.java:159)

i hope that you have an idea what has been broken here. many thanks in advance for fixing.