Fix changes for deleted fork in UI

As pingou told that "fork should be fork" so removing the ability to
send PR or have issue tracker for forks whoes main repo is deleted and a
clear message saying the "Main repo is deleted" in the UI.

pagure/templates/repo_master.html

@@ -78,6 +78,10 @@ <h2 class="repo-name m-b-0">
                 {{ repo.parent.fullname }}
             </a>
         </div>
+        {% elif repo.is_fork and not repo.parent %}
+        <div class="m-t-0">
+            Main repo is deleted
+        </div>
         {% endif %}
         <div class="projectinfo m-t-1 m-b-1">
         {% if repo.description %}{{ repo.description | safe }}{% else %}-{% endif -%}

pagure/ui/repo.py

@@ -1326,7 +1326,6 @@ def delete_repo(repo, username=None):
             'You are not allowed to change the settings for this project')
 
     try:
-        reponame = repo.fullname
         for issue in repo.issues:
             for comment in issue.comments:
                 SESSION.delete(comment)
@@ -1335,17 +1334,6 @@ def delete_repo(repo, username=None):
         SESSION.delete(repo)
         SESSION.commit()
 
-        projects = pagure.lib.search_projects(SESSION, fork=True, pattern=reponame)
-
-        if projects:
-            for project in projects:
-                project_settings = project.settings
-                project_settings['pull_requests'] = True
-                project_settings['issue_tracker'] = True
-                project.settings = project_settings
-                SESSION.add(project)
-            SESSION.commit()
-
     except SQLAlchemyError as err:  # pragma: no cover
         SESSION.rollback()
         APP.logger.exception(err)