Set a minimum package weight for USPS shipments. Handle per package errors.

docs/changelog/7.x.x.txt

@@ -6,6 +6,8 @@
  - fixed #11197: Survey Edit Console is not i18n'ed
  - fixed USPS driver only works on domestic addresses.
  - fixed Shop is not sending notification emails to the user, or to the notification group.
+ - Set a minimum package weight of 1 oz for the USPS driver.
+ - Handle per package errors in USPS response data.
 
 7.8.3
  - Rewrote Spectre's workflow queues to prevent it from "forgetting" about some workflows.

lib/WebGUI/Shop/ShipDriver/USPS.pm

@@ -74,6 +74,9 @@ sub buildXML {
         }
         my $pounds = int($weight);
         my $ounces = int(16 * ($weight - $pounds));
+        if ($pounds == 0 && $ounces == 0 ) {
+            $ounces = 1;
+        }
         my $destination = $package->[0]->getShippingAddress;
         my $destZipCode = $destination->get('code');
         $packageData{ID}              = $packageIndex;
@@ -199,6 +202,9 @@ sub _calculateFromXML {
         if ($id < 0 || $id > $#shippableUnits) {
             WebGUI::Error::Shop::RemoteShippingRate->throw(error => "Illegal package index returned by USPS: $id");
         }
+        if (exists $package->{Error}) {
+            WebGUI::Error::Shop::RemoteShippingRate->throw(error => $package->{Description});
+        }
         my $unit = $shippableUnits[$id];
         if ($unit->[0]->getSku->shipsSeparately) {
             ##This is a single item due to ships separately.  Since in reality there will be