Minor cosmetic changes + avoid warning PHP message

plugin/dashboard/block_session/block_session.class.php

@@ -156,4 +156,3 @@ class BlockSession extends Block {
 	}
 
 }
-?>

plugin/dashboard/block_student/block_student.class.php

@@ -212,7 +212,7 @@ class BlockStudent extends Block {
 	 				$course_code = $course['code'];
 	 				$cats = Category::load(null, null, $course_code, null, null, null, false);
 	 				$scoretotal = array();
-	 				if (isset($cats)) {		 				
+	 				if (isset($cats) && isset($cats[0])) {		 				
 		 				$scoretotal= $cats[0]->calc_score($student_id, $course_code);		 				
 	 				} 
 
@@ -257,7 +257,4 @@ class BlockStudent extends Block {
 	function get_number_of_students() {
 		return count($this->students);
 	}    
-    
 }
-
-?>

plugin/dashboard/block_student_graph/block_student_graph.class.php

@@ -211,4 +211,3 @@ class BlockStudentGraph extends Block {
 		return count($this->students);
 	}    
 }
-?>

plugin/dashboard/block_teacher/block_teacher.class.php

@@ -216,5 +216,3 @@ class BlockTeacher extends Block {
 	}
     
 }
-
-?>

plugin/dashboard/block_teacher_graph/block_teacher_graph.class.php

@@ -198,5 +198,3 @@ class BlockTeacherGraph extends Block {
 	}
     
 }
-
-?>