prevent undefined state placeholder
S Korea has no states. Closes #2257.
Fix checkout field visibility after switching country
dont trigger tab actions for shipping/billing
cleanup save function
When editing checkout fields, only refresh totals if required address fields are filled.
mutlselect case #2259
More descriptive variable name
Don't convert zero values to empty string

PHP's empty() function returns true for 0, 0.00, "0.00" and other 0 variants.
That means woocommerce_process_shop_order_meta() will convert item meta with
a 0.00 or similar value to an empty string, which can break things that expect
a float or number. This commit fixes that.
Merge pull request #2262 from thenbrent/shop_order_meta

Don't convert zero values to empty string in woocommerce_process_shop_order_meta()
rejig the hooks Closes #2263.
Closes #2261.
Fix multiselect name Closes #2259
Fix saving as array #2259
Issue 1950
order statuses
status colors
message buttons
Remove random var_dump(), add filter for ajax customer details load
better non-retina status icons