Null Coalescence doesn't return fallback if falsey variable uses a modifier

[richarderoche]

Bug Description

When using ?? or "or" to display a variable with a fallback it comes back blank if the first variable is null and has a modifier applied to it, even if the fallback variable is not null. However, Ternary format does work as expected.

How to Reproduce

Create something like this with the first variable being a null one and the second one existing, it will return nothing:
{{alt_title|upper ?? title|upper}}

This will return the title variable (as expected):
{{alt_title ?? title}}

This will return the title variable in uppercase (as expected):
{{alt_title ? alt_title|upper : title|upper}}

Extra Detail

Environment

Statamic version: 3.0.0.-beta-33

PHP version: 7.4

Install method (choose one):

• Fresh install from statamic/statamic

[ReneWeCode]

Confirms. I was struggling for a long time with this one: {{ title_override ?? title ensure_right=">" }}

[jackmcdade]

Confirmed. Will see what I can do!

Weirdly enough, the issue seems more related to the > than the modifier itself. This works (alt syntax):

{{ title_override ?? title | ensure_right:.com }}

[jasonvarga]

Unfortunately, we have to revert the change we made as we noticed it introduced unrelated issues. We'll get back to this though!

[github-actions]

This issue has not had recent activity and has been marked as stale — by me, a robot. Simply reply to keep it open and send me away. If you do nothing, I will close it in a week. I have no feelings, so whatever you do is fine by me.

[jelleroorda]

Open sesame

[cnc137]

I ran across this problem in the "Cool Writings" starter kit ( https://github.com/statamic/starter-kit-cool-writings ) if the "excerpt" is blank since the code uses the "widont" modifier. I submitted a pull request, mentioned above, to solve the problem in the starter kit based on the information provided above.