Handle if course is not inside evasys category

Author: justusdieckmann

block_evasys_sync.php

@@ -50,9 +50,13 @@ public function get_content() {
             return $this->content;
         }
 
+        $evasyscategory = \block_evasys_sync\evasys_category::for_course($this->page->course);
+        if (!$evasyscategory) {
+            return $this->content;
+        }
+
         $evalrequest = \block_evasys_sync\evaluation_request::for_course($this->page->course->id);
         $evaluations = \block_evasys_sync\evaluation::for_course($this->page->course->id);
-        $evasyscategory = \block_evasys_sync\evasys_category::for_course($this->page->course);
 
         $stringformat = get_string('strftimedatetime', 'langconfig');