Fix for issues 38540

[shmVan]

• fix Module Magento\Quote. The object $this->_customer always exists. Added a check for the existence of $this->getCustomerId() / If it is true  $this->setCustomerIsGuest(false);

Description (*)

This issue is caused when checking out from a guest cart programmatically, when you assign a customer to the cart before submitting it to place the order, the quote remains as guest even though a customer has been assigned.

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes When customer is set for quote order is still a guest order #38540

Manual testing scenarios (*)

1. Install custom module I38540V
2. Run command bin/magento order:place
3. After saving the quote, the customer_is_guest value must be false
   

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

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[shmVan]

@magento run all tests