Force version retrieval and path resolution in CustomVarscan

public/gentrap/src/main/scala/nl/lumc/sasc/biopet/pipelines/gentrap/extensions/CustomVarScan.scala

@@ -66,7 +66,10 @@ class CustomVarScan(val root: Configurable) extends BiopetCommandLineFunction {
     require(output.toString.endsWith(".gz"), "Output must have a .gz file extension")
   }
 
-  def cmdLine: String =
+  def cmdLine: String = {
+    // FIXME: manual trigger of commandLine for version retrieval
+    mpileup.commandLine
     mpileup.cmdPipe + " | " + fixMpileup.commandLine + " | " + removeEmptyPile.commandLine + " | " +
       varscan.commandLine + " | " + compress.commandLine + " && " + index.commandLine
+  }
 }