Check if bbcode is enable and filled before parsing and overwrite text property
Created by: leodimano
When the RichTextLabel node gets duplicates the last property to be duplicate is CustomEffects wich calls the parse_bbcode method. I've fix the parse_bbcode method to process only if the use_bbcode is flagged and there is actual bbcode to be parsed, otherwise keep the current node text.
Bugsquad edit: Fixes #35553