Remove unnecessary null check

The field monitor is never null, it's a NullProgressMonitor when not
explicitly set.

Change-Id: I8ce703a32c28ce5c3455efeb7ed5f5c9a443cbef

org.eclipse.jgit/src/org/eclipse/jgit/api/PullCommand.java

@@ -202,7 +202,6 @@ public class PullCommand extends GitCommand<PullResult> {
 
 			FetchCommand fetch = new FetchCommand(repo);
 			fetch.setRemote(remote);
-			if (monitor != null)
 			fetch.setProgressMonitor(monitor);
 			fetch.setTimeout(this.timeout);