Fix notices.

plugins/FeedsParser.inc

@@ -237,10 +237,10 @@ class FeedsDateTimeElement extends FeedsElement {
   protected static function readDateField($node, $field_name) {
     $field = content_fields($field_name);
     $ret = new FeedsDateTimeElement();
-    if ($node->{$field_name}[0]['date'] instanceof FeedsDateTime) {
+    if (isset($node->{$field_name}[0]['date']) && $node->{$field_name}[0]['date'] instanceof FeedsDateTime) {
       $ret->start = $node->{$field_name}[0]['date'];
     }
-    if ($node->{$field_name}[0]['date2'] instanceof FeedsDateTime) {
+    if (isset($node->{$field_name}[0]['date2']) && $node->{$field_name}[0]['date2'] instanceof FeedsDateTime) {
       $ret->end = $node->{$field_name}[0]['date2'];
     }
     return $ret;

plugins/FeedsSimplePieParser.inc

@@ -75,9 +75,9 @@ class FeedsSimplePieParser extends FeedsParser {
         $item['guid'] = $item['url'];
       }
       $author = $simplepie_item->get_author();
-      $item['author_name'] = html_entity_decode($author->name);
-      $item['author_link'] = $author->link;
-      $item['author_email'] = $author->email;
+      $item['author_name'] = isset($author->name) ? html_entity_decode($author->name) : '';
+      $item['author_link'] = isset($author->link) ? $author->link : '';
+      $item['author_email'] = isset($author->email) ? $author->email : '';
       // Enclosures
       $enclosures = $simplepie_item->get_enclosures();
       if (is_array($enclosures)) {