Add guard clause for TaxLocation addresses

From Solidus Documentation:
An order's tax_address can – through duck typing  – be a
Spree::TaxLocation instead of the shipping address.

This adds a guard clause that validates if the tax_address is a
TaxLocation, in this case we know that the address is incomplete.

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/super_good/solidus_taxjar/tax_calculator.rb b/lib/super_good/solidus_taxjar/tax_calculator.rb
index 327e248..25339ac 100644
--- a/lib/super_good/solidus_taxjar/tax_calculator.rb
+++ b/lib/super_good/solidus_taxjar/tax_calculator.rb
@@ -152,6 +152,8 @@ module SuperGood
       end
 
       def incomplete_address?(tax_address)
+        return true if tax_address.is_a?(Spree::Tax::TaxLocation)
+
         [
           tax_address.address1,
           tax_address.city,