[BUG] Passing null to parameter #1 of type string is deprecated in Plugin/Shipment/ShippingBuilder.php on line 37

[DuckThom]

To Reproduce
Steps to reproduce the behavior:

1. Have an order without a shipping method (Not fully sure how to create such an order, but the order causing the issue on our side has the status 'cancelled' plus the field can be null in the database)

Expected result
No exception is thrown

Actual result

An exception is thrown and the GraphQL query is aborted

[2024-07-03T09:02:50.017338+00:00] report.ERROR: Deprecated Functionality: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in /data/web/uat_magento_2/vendor/tig/postnl-magento2/Plugin/Shipment/ShippingBuilder.php on line 37

GraphQL (30:13)
29:         customer {
30:             orders(pageSize: $pageSize, currentPage: $currentPage) {
                ^
31:                 total_count
 [] []

Workaround

Manually updating/patching the following line to cast $method to a string

postnl-magento2/Plugin/Shipment/ShippingBuilder.php

Line 37 in 1e8f126

strpos($method, 'tig_postnl') !== false &&

Screenshots

** Please complete the following information**

• Magento version: 2.4.5-p8
• PHP version: 8.1.18
• TIG PostNL version: 1.15.2

[downforce80]

We had the same issue when creating a magento admin order in the backend with shipping method postNL.

Magento ver. 2.4.4-p9
PostNL version: 1.15.2

[rbouma]

We have the same issue for a placed order that have no shipment method selected. By opening the admin it breaks on the strpos.

added a fix in #387