Make dict required for all gatk tools

protected/biopet-gatk-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/gatk/broad/CommandLineGATK.scala

@@ -2,9 +2,9 @@ package nl.lumc.sasc.biopet.extensions.gatk.broad
 
 import java.io.File
 
-import nl.lumc.sasc.biopet.core.{BiopetJavaCommandLineFunction, Reference, Version}
+import nl.lumc.sasc.biopet.core.{ BiopetJavaCommandLineFunction, Reference, Version }
 import org.broadinstitute.gatk.queue.extensions.gatk.TaggedFile
-import org.broadinstitute.gatk.utils.commandline.{Argument, Gather, Input, Output}
+import org.broadinstitute.gatk.utils.commandline.{ Argument, Gather, Input, Output }
 
 trait CommandLineGATK extends BiopetJavaCommandLineFunction with Reference with Version {
   analysisName = "CommandLineGATK"
@@ -320,6 +320,8 @@ trait CommandLineGATK extends BiopetJavaCommandLineFunction with Reference with
   override def versionExitcode = List(0, 1)
   def versionCommand = executable + " -jar " + jarFile + " -version"
 
+  override def dictRequired = true
+
   override def beforeGraph() {
     super.beforeGraph()
     if (reference_sequence != null) reference_sequence = referenceFasta()