Null error during synchronous query to TAP_SCHEMA in Taplint Validation

[stvoutsin]

Description
Taplint produces an error with a Synchronous query to TAP_SCHEMA
"E-TMS-QERR-1 TAP query failed [Service error: "null"]".

TAP URL:
http://tap.roe.ac.uk/vsa

Exception Stack Trace:

Section TMS: Check content of tables metadata from TAP_SCHEMA
I-TMS-TAPV-1 Validating for TAP version V1.0
I-TMS-QSUB-1 Submitting query: SELECT COUNT(*) AS nr FROM TAP_SCHEMA.schemas
I-TMS-QGET-1 Query GET URL: http://tap.roe.ac.uk/firethorn/tap/59/sync?REQUEST=doQuery&LANG=ADQL&QUERY=SELECT+COUNT%28*%29+AS+nr+FROM+TAP_SCHEMA.schemas
E-TMS-QERR-1 TAP query failed [Service error: "null"]
java.io.IOException: Service error: "null"
	at uk.ac.starlink.ttools.taplint.VotLintTapRunner.readResultVOTable(VotLintTapRunner.java:369)
	at uk.ac.starlink.ttools.taplint.VotLintTapRunner.executeQuery(VotLintTapRunner.java:113)
	at uk.ac.starlink.ttools.taplint.TapRunner.attemptGetResultTable(TapRunner.java:79)
	at uk.ac.starlink.ttools.taplint.TapRunner.getResultTable(TapRunner.java:51)
	at uk.ac.starlink.ttools.taplint.TapSchemaStage.getRowCount(TapSchemaStage.java:313)
	at uk.ac.starlink.ttools.taplint.TapSchemaStage.getMetaMaxrec(TapSchemaStage.java:288)
	at uk.ac.starlink.ttools.taplint.TapSchemaStage.readTableMetadata(TapSchemaStage.java:66)
	at uk.ac.starlink.ttools.taplint.TableMetadataStage.run(TableMetadataStage.java:95)
	at uk.ac.starlink.ttools.taplint.TapSchemaStage.run(TapSchemaStage.java:47)
	at uk.ac.starlink.ttools.taplint.TapLinter$4.execute(TapLinter.java:234)
	at uk.ac.starlink.ttools.task.LineInvoker.invoke(LineInvoker.java:303)