changed workflow

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -1
	at java.lang.String.substring(String.java:1937)
	at org.molgenis.compute5.model.Step.setParameters(Step.java:84)
	at org.molgenis.compute5.parsers.WorkflowCsvParser.parse(WorkflowCsvParser.java:37)
	at org.molgenis.compute5.ComputeCommandLine.create(ComputeCommandLine.java:198)
	at org.molgenis.compute5.ComputeCommandLine.create(ComputeCommandLine.java:249)
	at org.molgenis.compute.db.generator.TaskGeneratorDB.generateRun(TaskGeneratorDB.java:31)
	at org.molgenis.compute.db.generator.TaskGeneratorDB.main(TaskGeneratorDB.java:61)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)