New feature: shareable user query (#6052)

* New feature: shareable user query
Share the output of a user query by RSS / HTML / OPML with other people through unique URLs.
Replaces the global admin token, which was the only option (but unsafe) to share RSS outputs with other people.
Also add a new HTML output for people without an RSS reader.

fix https://github.com/FreshRSS/FreshRSS/issues/3066#issuecomment-648977890
fix https://github.com/FreshRSS/FreshRSS/issues/3178#issuecomment-769435504

* Remove unused method

* Fix token saving

* Implement HTML view

* Update i18n for master token

* Revert i18n get_favorite

* Fix missing i18n for user queries from before this PR

* Remove irrelevant tests

* Add link to RSS version

* Fix getGet

* Fix getState

* Fix getSearch

* Alternative getSearch

* Default getOrder

* Explicit default state

* Fix test

* Add OPML sharing

* Remove many redundant SQL queries from original implementation of user queries

* Fix article tags

* Use default user settings

* Prepare public search

* Fixes

* Allow user search on article tags

* Implement user search

* Revert filter bug

* Revert wrong SQL left outer join change

* Implement checkboxes

* Safe check of OPML

* Fix label

* Remove RSS button to favour new sharing method
That sharing button was using a global admin token

* First version of HTTP 304

* Disallow some recusrivity
fix https://github.com/FreshRSS/FreshRSS/issues/6086

* Draft of nav

* Minor httpConditional

* Add support for offset for pagination

* Fix offset pagination

* Fix explicit order ASC

* Add documentation

* Help links i18n

* Note about deprecated master token

* Typo

* Doc about format

1 files changed, 2 insertions, 2 deletions

diff --git a/app/Controllers/statsController.php b/app/Controllers/statsController.php
index f40f0dd29..8ff2744ae 100644
--- a/app/Controllers/statsController.php
+++ b/app/Controllers/statsController.php
@@ -193,7 +193,7 @@ class FreshRSS_stats_Controller extends FreshRSS_ActionController {
 		if ($id !== 0) {
 			$this->view->displaySlider = true;
 			$feedDAO = FreshRSS_Factory::createFeedDao();
-			$this->view->feed = $feedDAO->searchById($id);
+			$this->view->feed = $feedDAO->searchById($id) ?? FreshRSS_Feed::default();
 		}
 	}
 
@@ -222,7 +222,7 @@ class FreshRSS_stats_Controller extends FreshRSS_ActionController {
 		}
 
 		$this->view->categories 	= $categoryDAO->listCategories(true) ?: [];
-		$this->view->feed 			= $id === null ? null : $feedDAO->searchById($id);
+		$this->view->feed 			= $id === null ? FreshRSS_Feed::default() : ($feedDAO->searchById($id) ?? FreshRSS_Feed::default());
 		$this->view->days 			= $statsDAO->getDays();
 		$this->view->months 		= $statsDAO->getMonths();