NPE on W3C validator

[karoldrazek]

Version used

• AET 2.1.7-SNAPSHOT (the one embedded in aet-docker 0.3.0)

Context of the issue/feature

When I opened the report on one of the tests of W3C validation it shown Null Pointer Exception.

Screenshot

Error log

2018-09-04T08:06:38,206 | ERROR | com.cognifide.aet.worker | ComparatorDispatcherImpl 68 | Comparator{type=source, filters=[Operation{type=w3c-filter, parameters={message=Bad value ...noopener noreferrer... for attribute ...rel.
com.cognifide.aet.job.api.exceptions.ProcessingException: null
at com.cognifide.aet.job.common.comparators.w3chtml5.W3cHtml5Comparator.compare(W3cHtml5Comparator.java:75) ~[?:?]
at com.cognifide.aet.worker.impl.ComparatorDispatcherImpl.run(ComparatorDispatcherImpl.java:66) [193:com.cognifide.aet.worker:2.1.7.SNAPSHOT]
at com.cognifide.aet.worker.listeners.ComparatorMessageListenerImpl.onMessage(ComparatorMessageListenerImpl.java:95) [193:com.cognifide.aet.worker:2.1.7.SNAPSHOT]
at org.apache.activemq.ActiveMQMessageConsumer.dispatch(ActiveMQMessageConsumer.java:1404) [64:org.apache.activemq.activemq-osgi:5.15.2]
at org.apache.activemq.ActiveMQSessionExecutor.dispatch(ActiveMQSessionExecutor.java:131) [64:org.apache.activemq.activemq-osgi:5.15.2]
at org.apache.activemq.ActiveMQSessionExecutor.iterate(ActiveMQSessionExecutor.java:202) [64:org.apache.activemq.activemq-osgi:5.15.2]
at org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:133) [64:org.apache.activemq.activemq-osgi:5.15.2]
at org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:48) [64:org.apache.activemq.activemq-osgi:5.15.2]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:?]
at java.lang.Thread.run(Thread.java:748) [?:?]
Caused by: java.lang.NullPointerException