NTP: Remove workaround for empty list array

This workaround is no longer needed with bmcweb.

curl  -k -H "Content-Type: application/json" -X PUT \
-d '{"data": [] }' \
https://${bmc}/xyz/openbmc_project/network/eth0/attr/NTPServers

See https://github.com/openbmc/openbmc/issues/3240

Tested: Built and loaded on a Witherspoon. Added, removed, and
        edited NTP servers.
Change-Id: Ia106067a479c63a5761b1f62c624d3ccc6df55c7
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/app/configuration/controllers/date-time-controller.js b/app/configuration/controllers/date-time-controller.js
index d678ab4..92864db 100644
--- a/app/configuration/controllers/date-time-controller.js
+++ b/app/configuration/controllers/date-time-controller.js
@@ -164,15 +164,10 @@
       };
 
       function setNTPServers() {
-        // Remove any empty strings from the array. Important because we add an
-        // empty string to the end so the user can add a new NTP server, if the
+        // Remove any empty strings from the array. If the
         // user doesn't fill out the field, we don't want to add.
         $scope.ntp.servers = $scope.ntp.servers.filter(Boolean);
-        // NTP servers does not allow an empty array, since we remove all empty
-        // strings above, could have an empty array. TODO: openbmc/openbmc#3240
-        if ($scope.ntp.servers.length == 0) {
-          $scope.ntp.servers.push('');
-        }
+
         return APIUtils.setNTPServers($scope.ntp.servers);
       }