squash DAS server not found exception when Jalview starts up

Jalview throws an exception on the console when an alignment is opened because the DAS registry no longer resolves. It shouldn't.

WARN - GET request for "http://www.ebi.ac.uk/das-srv/registry/das//sources" resulted in 404 (Not Found); invoking error handler
Failed to contact DAS1 registry at http://www.ebi.ac.uk/das-srv/registry/das/
org.biodas.jdas.exceptions.DASClientException: 404 Not Found
at org.biodas.jdas.client.SourcesClient.fetchData(SourcesClient.java:77)
at org.biodas.jdas.client.SourcesClient.fetchDataRegistry(SourcesClient.java:126)
at jalview.ws.dbsources.das.datamodel.DasSourceRegistry.getDASSources(DasSourceRegistry.java:121)
at jalview.ws.dbsources.das.datamodel.DasSourceRegistry.getDASSources(DasSourceRegistry.java:104)
at jalview.ws.dbsources.das.datamodel.DasSourceRegistry.getSources(DasSourceRegistry.java:170)
at jalview.ws.dbsources.das.datamodel.DasSourceRegistry.run(DasSourceRegistry.java:162)
at jalview.ws.dbsources.das.datamodel.DasSourceRegistry.refreshSources(DasSourceRegistry.java:344)
at jalview.gui.SequenceFetcher.getSequenceFetcherSingleton(SequenceFetcher.java:186)
at jalview.gui.AlignFrame$18.run(AlignFrame.java:5044)
at java.lang.Thread.run(Thread.java:745)