cleanup unused code

Author: Vladimir Kotal

opengrok-indexer/src/main/java/org/opengrok/indexer/history/MercurialHistoryParser.java

@@ -126,7 +126,7 @@ public void processStream(InputStream input) throws IOException {
             } else if (s.startsWith(MercurialRepository.USER) && entry != null) {
                 entry.setAuthor(s.substring(MercurialRepository.USER.length()).trim());
             } else if (s.startsWith(MercurialRepository.DATE) && entry != null) {
-                Date date = new Date();
+                Date date;
                 try {
                     date = df.parse(s.substring(MercurialRepository.DATE.length()).trim());
                 } catch (ParseException pe) {

opengrok-indexer/src/main/java/org/opengrok/indexer/history/Repository.java

@@ -552,7 +552,7 @@ public Date parse(String source) throws ParseException {
                                     locale),
                             ex1.getErrorOffset()
                     );
-                    if (head == null || tail == null) {
+                    if (head == null) {
                         head = tail = ex1;
                     } else {
                         tail.initCause(ex1);