Add an error message when a query is deprecated.

See https://github.com/marienfressinaud/FreshRSS/issues/625

app/i18n/en.php

@@ -46,6 +46,7 @@ return array (
 	'no_query'			=> 'You haven’t created any user query yet.',
 	'query_filter'			=> 'Filter applied:',
 	'no_query_filter'		=> 'No filter',
+	'query_deprecated'		=> 'This query is no longer valid. The concerned category or feed has been deleted.',
 	'about'				=> 'About',
 	'stats'				=> 'Statistics',
 	'stats_idle'			=> 'Idle feeds',

app/i18n/fr.php

@@ -46,6 +46,7 @@ return array (
 	'no_query'			=> 'Vous n’avez pas encore créé de filtre.',
 	'query_filter'			=> 'Filtres appliqués :',
 	'no_query_filter'		=> 'Aucun filtre appliqué',
+	'query_deprecated'		=> 'Ce filtre n’est plus valide. La catégorie ou le flux concerné a été supprimé.',
 	'about'				=> 'À propos',
 	'stats'				=> 'Statistiques',
 	'stats_idle'			=> 'Flux inactifs',

app/views/configure/queries.phtml

@@ -42,30 +42,37 @@
 						   + (isset($query['get']) ? 1 : 0);
 					// If the only filter is "all" articles, we consider there is no filter
 					$exist = ($exist === 1 && isset($query['get']) && $query['get'] === 'a') ? 0 : $exist;
+
+					$deprecated = (isset($this->query_get[$key]) &&
+					               $this->query_get[$key]['deprecated']);
 				?>
 
 				<?php if ($exist === 0) { ?>
 				<div class="alert alert-warn">
 					<div class="alert-head"><?php echo _t('no_query_filter'); ?></div>
 				</div>
+				<?php } elseif ($deprecated) { ?>
+				<div class="alert alert-error">
+					<div class="alert-head"><?php echo _t('query_deprecated'); ?></div>
+				</div>
 				<?php } else { ?>
 				<div class="alert alert-success">
 					<div class="alert-head"><?php echo _t('query_filter'); ?></div>
 
 					<ul>
-						<?php if (isset($query['search'])) { $exist = true; ?>
+						<?php if (isset($query['search'])) { ?>
 						<li class="item"><?php echo _t('query_search', $query['search']); ?></li>
 						<?php } ?>
 
-						<?php if (isset($query['state'])) { $exist = true; ?>
+						<?php if (isset($query['state'])) { ?>
 						<li class="item"><?php echo _t('query_state_' . $query['state']); ?></li>
 						<?php } ?>
 
-						<?php if (isset($query['order'])) { $exist = true; ?>
+						<?php if (isset($query['order'])) { ?>
 						<li class="item"><?php echo _t('query_order_' . strtolower($query['order'])); ?></li>
 						<?php } ?>
 
-						<?php if (isset($query['get'])) { $exist = true; ?>
+						<?php if (isset($query['get'])) { ?>
 						<li class="item"><?php echo _t('query_get_' . $this->query_get[$key]['type'], $this->query_get[$key]['name']); ?></li>
 						<?php } ?>
 					</ul>