Avoid messages when Product is not connected to a Brand

[bobbingwide]

When I imported the two products from my original test environment WordPress Importer reported that everything was OK but that wasn't actually the case.

Product	Original ID	New ID	Brand
A test product 6 x 4 ft	7982	9565	[CDATA[a:1:{i:0;s:4:"2314";}]] = BIC
A test product 10 x 10ft	8030	9566	[CDATA[a:1:{i:0;s:4:"2318";}]]

The value for the Brand relationship for 9566 was incorrect ID 2318 doesn't match any value: BIC (2314), Eden Greenhouses (2316) nor Elite Greenhouses (8593)

Therefore it failed when looking up the brand to find:

• postcodes excluded
• delivery costs for each Band
• Installation Cost override
• Offer base options
• featured image

Since no brand was returned the code failed trying to process a null field.

Workaround

• Edit the product to attach a Brand

Fix

• Alter the code to cater for the data issue.

Originally posted by @bobbingwide in https://github.com/bobbingwide/gardenvista/issues/27#issuecomment-1779539717

[bobbingwide]

Note: You can see which products are not connected to a Brand using

• Tools > GVG bulk update.
• Select the Product Sales tab
• In the Brand selection box choose Brand None and then Display Products

There are currently 30 products not connected, including one called test ( ID 9557 ) ... which is still causing problems!

The Brand can also be viewed on the Product Ranges tab.