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Bug fix classification group_info error when not using `--node`

Workum, Dirk-Jan van requested to merge bugfix_classification_groupnodes_file into master

Running pantools group_info tmp_DB hm.csv gave an unexpected error:

Sep 13, 2022 9:16:28 AM org.hibernate.validator.internal.util.Version <clinit>
INFO: HV000001: Hibernate Validator null

Reporting all information from selected homology groups

Gathering functions from homology groups: 12/12java.lang.NullPointerException
	at nl.wur.bif.pantools.pangenome.Classification.homology_group_info(Classification.java:1173)
	at nl.wur.bif.pantools.cli.GroupInfo.call(GroupInfo.java:58)
	at nl.wur.bif.pantools.cli.GroupInfo.call(GroupInfo.java:22)
	at picocli.CommandLine.executeUserObject(CommandLine.java:1953)
	at picocli.CommandLine.access$1300(CommandLine.java:145)
	at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2358)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2352)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2314)
	at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2179)
	at picocli.CommandLine$RunLast.execute(CommandLine.java:2316)
	at nl.wur.bif.pantools.pantools.Pantools.executionStrategy(Pantools.java:172)
	at picocli.CommandLine.execute(CommandLine.java:2078)
	at nl.wur.bif.pantools.pantools.Pantools.main(Pantools.java:139)

This seems to be caused by not always checking whether Mode.contains("K-MER"); therefore, this merge request checks that before writing to nodeBuilder.

tl;dr: prevent NullPointerException for nodeBuilder by checking whether Mode contains 'K-MER'

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