Get rid of warnings about empty statments

In HtttpAuthMethod there were comments, but not in a style
that Eclipse recognizes.

Change-Id: I64f55b27143f8badcefbb419d3951f2a26b87d5f
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/TestRepository.java

@@ -459,9 +459,13 @@ public class TestRepository<R extends Repository> {
 	 */
 	public <T extends AnyObjectId> T update(String ref, T obj) throws Exception {
 		if (Constants.HEAD.equals(ref)) {
+			// nothing
 		} else if ("FETCH_HEAD".equals(ref)) {
+			// nothing
 		} else if ("MERGE_HEAD".equals(ref)) {
+			// nothing
 		} else if (ref.startsWith(Constants.R_REFS)) {
+			// nothing
 		} else
 			ref = Constants.R_HEADS + ref;
 
@@ -537,7 +541,9 @@ public class TestRepository<R extends Repository> {
 	 */
 	public BranchBuilder branch(String ref) {
 		if (Constants.HEAD.equals(ref)) {
+			// nothing
 		} else if (ref.startsWith(Constants.R_REFS)) {
+			// nothing
 		} else
 			ref = Constants.R_HEADS + ref;
 		return new BranchBuilder(ref);

org.eclipse.jgit/src/org/eclipse/jgit/lib/RefDatabase.java

@@ -219,5 +219,6 @@ public abstract class RefDatabase {
 	 * Implementors should overwrite this method if they use any kind of caches.
 	 */
 	public void refresh() {
+		// nothing
 	}
 }

org.eclipse.jgit/src/org/eclipse/jgit/transport/HttpAuthMethod.java

@@ -277,12 +277,14 @@ abstract class HttpAuthMethod {
 			r.append("://");
 			r.append(u.getHost());
 			if (0 < u.getPort()) {
-				if (u.getPort() == 80 && "http".equals(u.getProtocol()))
-					/* nothing */;
-				else if (u.getPort() == 443 && "https".equals(u.getProtocol()))
-					/* nothing */;
-				else
+				if (u.getPort() == 80 && "http".equals(u.getProtocol())) {
+					/* nothing */
+				} else if (u.getPort() == 443
+						&& "https".equals(u.getProtocol())) {
+					/* nothing */
+				} else {
 					r.append(':').append(u.getPort());
+				}
 			}
 			r.append(u.getPath());
 			if (u.getQuery() != null)