Fixed that URL does not contain the "empty"

Order to remove the hierarchy of unnecessary 'empty' from a URL.

Because the generated HTML links does not work correctly.

Author: magnolia

scalac-scoverage-plugin/src/main/scala/scoverage/report/ScoverageHtmlWriter.scala

@@ -215,9 +215,7 @@ class ScoverageHtmlWriter(sourceDirectory: File, outputDir: File) {
       val path = fileRelativeToSource.getParent
       val value = fileRelativeToSource.getName
 
-      if (path.eq(null)) {
-        "(empty)/" + value
-      } else if (path.ne("")) {
+      if (path.ne("")) {
         // (Normalise the pathSeparator to "/" in case we are running on Windows)
         fileRelativeToSource.toString.replace(File.separator, "/")
       } else {