Fix padded-blocks eslint rule in ES5 files

[MAILPOET-1144]

assets/js/src/jquery.serialize_object.js

@@ -80,7 +80,6 @@ define(
               : val;
             cur = cur[key];
           }
-
         } else {
           // Simple key, even simpler rules, since only scalars and shallow
           // arrays are allowed.
@@ -88,12 +87,10 @@ define(
           if ($.isArray(obj[key])) {
             // val is already an array, so push on the next value.
             obj[key].push(val);
-
           } else if (obj[key] !== undefined) {
             // val isn't an array, but since a second value has been specified,
             // convert val into an array.
             obj[key] = [obj[key], val];
-
           } else {
             // val is a scalar.
             obj[key] = val;