I have a flow setup for when an item is created or modified in SharePoint. I'm trying to set it up so that if a value exists in a field (is not empty), it takes the value and adds it to the end of a URL and adds it to my send email action (referenced as Case # in the screenshot). I know I can create a variable and then use a compose action to generate the URL I'm wanting. I just don't know what to do if the value is blank (null) where I would not want to include the URL.

I would then simply put the MyURL output into my email and it would work fine. But if the Case # value is blank, I want to skip the URL all together.