Fix GitHubRepositoryManager problem

- Use correct id as a key instead of null value

Author: junichi11

src/main/java/com/junichi11/netbeans/modules/github/issues/GitHubIssuesConnector.java

@@ -78,11 +78,11 @@ public Repository createRepository() {
     @Override
     public Repository createRepository(RepositoryInfo info) {
         GitHubRepository repository = new GitHubRepository(info);
+        GitHubRepositoryManager.getInstance().add(repository);
         return createRepository(repository);
     }
 
     private Repository createRepository(GitHubRepository repository) {
-        GitHubRepositoryManager.getInstance().add(repository);
         GitHubIssues githubIssues = GitHubIssues.getInstance();
         BugtrackingSupport<GitHubRepository, GitHubQuery, GitHubIssue> bugtrackingSupport = githubIssues.getBugtrackingSupport();
         return bugtrackingSupport.createRepository(

src/main/java/com/junichi11/netbeans/modules/github/issues/repository/GitHubRepositoryController.java

@@ -104,6 +104,7 @@ public void applyChanges() {
                 .setRepositoryAuthor(p.getRepositoryAuthor())
                 .setRepositoryName(p.getRepositoryName());
         repository.setRepositoryInfo(gitHubRepositoryInfo);
+        GitHubRepositoryManager.getInstance().add(repository);
     }
 
     @Override