Check for non-empty uid post parameters

improve fix from commit 5b7e9a2c9

plugins/archive/archive.php

@@ -122,8 +122,10 @@ class archive extends rcube_plugin
       $index = $storage->index(null, rcmail_sort_column(), rcmail_sort_order());
       $messageset = array($current_mbox => $index->get());
     }
-    else {
+    else if (!empty($uids)) {
       $messageset = rcmail::get_uids($uids, $current_mbox);
+    } else {
+      $messageset = array();
     }
 
     foreach ($messageset as $mbox => $uids) {

plugins/markasjunk/markasjunk.php

@@ -62,10 +62,13 @@ class markasjunk extends rcube_plugin
 
         $rcmail  = rcmail::get_instance();
         $storage = $rcmail->get_storage();
+        $uids = rcube_utils::get_input_value('_uid', rcube_utils::INPUT_POST);
 
-        foreach (rcmail::get_uids(rcube_utils::get_input_value('_uid', rcube_utils::INPUT_POST)) as $mbox => $uids) {
-            $storage->unset_flag($uids, 'NONJUNK', $mbox);
-            $storage->set_flag($uids, 'JUNK', $mbox);
+        if (!empty($uids)) {
+            foreach (rcmail::get_uids($uids) as $mbox => $uids) {
+                $storage->unset_flag($uids, 'NONJUNK', $mbox);
+                $storage->set_flag($uids, 'JUNK', $mbox);
+            }
         }
 
         if (($junk_mbox = $rcmail->config->get('junk_mbox'))) {