TypeError: Drupal\route_in_modal\ModalRouteHelper::routeHasModal(): Argument #1 ($route) must be of type string, null given

Problem/Motivation

routeHasModal function, which is used to check if the route is configured to open in modal, gets an error if the used route within a link is NULL.

Steps to reproduce

Add a link to a page with a route that doesn't exist and add this route to the routes to be opened in a modal within the module config.

Proposed resolution

Use the correct type hinting to allow a route to be NULL since the built in PHP function in_array will return false in this case.

Remaining tasks

Provide patch
Review patch

User interface changes

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API changes

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Data model changes

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