hg: code-tools/jtharness: 7902308: Replace concatenation with an empty string with String.valueOf

[dmitry.bessonov at oracle.com]

Changeset: 364cb5a1098d
Author:    dbessono
Date:      2018-09-05 15:37 +0100
URL:       http://hg.openjdk.java.net/code-tools/jtharness/rev/364cb5a1098d

7902308: Replace concatenation with an empty string with String.valueOf

! src/com/sun/javatest/exec/ExcludeListBrowser.java
! src/com/sun/javatest/exec/LogViewerTools.java
! src/com/sun/javatest/finder/HTMLTestFinder.java
! src/com/sun/javatest/logging/LogModel.java
! src/com/sun/javatest/mrep/OptionsDialog.java