Workaround for empty title

public/bammetrics/src/main/scala/nl/lumc/sasc/biopet/pipelines/bammetrics/BamMetrics.scala

@@ -157,7 +157,7 @@ class BamMetrics(val root: Configurable) extends QScript with SummaryQScript wit
       add(BedtoolsCoverage(this, inputBam, intervals.bed, coverageFile, depth = true), true)
       val covStats = CoverageStats(this, coverageFile, targetDir)
       covStats.title = Some("Coverage for " + targetName)
-      covStats.subTitle = Some(" ")
+      covStats.subTitle = Some(".")
       add(covStats)
       addSummarizable(covStats, "cov_stats")
     }