Fixing random error test

shiva/src/test/scala/nl/lumc/sasc/biopet/pipelines/shiva/ShivaVariantcallingTest.scala

@@ -19,7 +19,7 @@
   */
 package nl.lumc.sasc.biopet.pipelines.shiva
 
-import java.io.{File, FileOutputStream}
+import java.io.{File, FileOutputStream, IOException}
 
 import com.google.common.io.Files
 import nl.lumc.sasc.biopet.core.BiopetPipe
@@ -208,8 +208,15 @@ trait ShivaVariantcallingTestTrait extends TestNGSuite with Matchers {
   }
 
   // remove temporary run directory all tests in the class have been run
-  @AfterClass def removeTempOutputDir(): Unit = {
-    dirs.foreach(FileUtils.deleteDirectory)
+  @AfterClass def removeTempOutputDir() = {
+    dirs.filter(_.exists()).foreach { dir =>
+      try {
+        FileUtils.deleteDirectory(dir)
+      } catch {
+        case e: IOException if e.getMessage.startsWith("Unable to delete directory") =>
+          Logging.logger.error(e.getMessage)
+      }
+    }
   }
 }