fix: weird bug when clicking everywhere fast

ui/time_entries_items_tree.gd

@@ -36,8 +36,11 @@ func get_current_text() -> String:
 	var item := get_selected()
 	if not item:
 		return ""
-	var resp: String = item.get_metadata(COL.TEXT)
-	return resp
+	
+	var resp = item.get_metadata(COL.TEXT)
+	if resp is String:
+		return resp
+	return ""
 
 
 ## Adds a new item to the tree, or returns the old item if it exists