Cant pass null to var.tags

[drewmullen]

╷
│ Error: Error in function call
│ 
│   on .terraform/modules/tags/locals.tf line 23, in locals:
│   23:   tags = try(
│   24:     # Tags are already in awscc format
│   25:     concat(local.generated_tags_awscc, var.tags),
│   26:     # Tags are in aws format. Convert to awscc format
│   27:     concat(local.generated_tags_awscc, [for k, v in var.tags : { key : k, value : v }])
│   28:   )
│     ├────────────────
│     │ local.generated_tags_awscc is tuple with 2 elements
│     │ var.tags is null
│ 
│ Call to function "try" failed: no expression succeeded:
│ - Invalid function argument (at .terraform/modules/tags/locals.tf:25,40-48)
│   Invalid value for "seqs" parameter: argument must not be null.
│ - Iteration over null value (at .terraform/modules/tags/locals.tf:27,53-61)
│   A null value cannot be used as the collection in a 'for' expression.
│ 
│ At least one expression must produce a successful result.