cleanup per issues noted in build rpt

git-svn-id: https://pmd.svn.sourceforge.net/svnroot/pmd/trunk@6355 51baf565-9d33-0410-a72c-fc3788e3496d

pmd/src/net/sourceforge/pmd/lang/LanguageVersion.java

@@ -187,7 +187,9 @@ public enum LanguageVersion {
      */
     public static String commaSeparatedTerseNames(List<LanguageVersion> languageVersions) {
     	
-    	if (languageVersions == null || languageVersions.size() == 0) return "";
+    	if (languageVersions == null || languageVersions.isEmpty()) {
+    		return "";
+    	}
     	
     	StringBuilder builder = new StringBuilder();
     	builder.append(languageVersions.get(0).getTerseName());