fix(services): Empty environment variables are not maintained (#836)

app/components/createService/createServiceController.js

@@ -145,7 +145,7 @@ function ($scope, $state, Service, ServiceHelper, Volume, Network, ImageHelper,
   function prepareEnvConfig(config, input) {
     var env = [];
     input.Env.forEach(function (v) {
-      if (v.name && v.value) {
+      if (v.name) {
         env.push(v.name + "=" + v.value);
       }
     });

app/components/service/serviceController.js

@@ -324,7 +324,7 @@ function ($scope, $stateParams, $state, $location, $anchorScroll, Service, Servi
     if (env) {
       var variables = [];
       env.forEach(function(variable) {
-        if (variable.key && variable.key !== '' && variable.value && variable.value !== '') {
+        if (variable.key && variable.key !== '') {
           variables.push(variable.key + '=' + variable.value);
         }
       });