Merge pull request #1 from robsonsobral/patch-1

Added empty option to the selecte dropdown and validation to the Matrix Cell.

system/expressionengine/third_party/morematrixrelations/ft.morematrixrelations.php

@@ -37,7 +37,7 @@ public function display_cell($data)
 		$this->EE->db->select('entry_id, title, status');
 		$q = $this->EE->db->get('channel_titles');
 
-		$entries = array();
+		$entries = array( NULL => '--');
 		foreach($q->result() as $qr){
 			$entries[$qr->entry_id] = $qr->status == "closed" ? $qr->title  . " [closed]" : $qr->title;
 		}
@@ -71,6 +71,20 @@ public function display_cell_settings($data = array())
 	}
 
 
+	// ====================
+	// = Field validation =
+	// ====================
+	public function validate_cell( $data )
+	{
+	  if ($this->settings['col_required'] == 'y') {
+		if (! $data) {
+		  return lang('col_required');
+		}
+	  }
+	  return TRUE;
+	}
+
+
 	// ===========================
 	// = Render tag in front end =
 	// ===========================