Comply to rubocop

Gemfile

@@ -5,10 +5,10 @@ gemspec
 
 # Development dependencies
 gem 'bundler'
-gem 'rake'
+gem 'colorize'
 gem 'minitest'
 gem 'minitest-reporters'
-gem 'colorize'
-gem 'rubocop', '1.24.1'
 gem 'pry'
+gem 'rake'
+gem 'rubocop', '1.24.1'
 gem 'simplecov', '0.21.2'

lib/schemacop/v3/array_node.rb

@@ -150,6 +150,7 @@ def children
 
       def cast(value)
         return default unless value
+
         value = parse_if_json(value, allowed_types: { Array => :array })
 
         result = []

lib/schemacop/v3/node.rb

@@ -192,25 +192,21 @@ def process_json(attrs, json)
         return json.as_json
       end
 
-      def parse_if_json(data, result: nil, allowed_types:)
+      def parse_if_json(data, allowed_types:, result: nil)
         if data.is_a?(String)
           data = JSON.parse(data)
 
-          if result
-            return nil unless validate_type(data, result, allowed_types: allowed_types)
+          if result && !validate_type(data, result, allowed_types: allowed_types)
+            return nil
           end
         end
 
         return data
       rescue JSON::ParserError => e
-        if result
-          result.error "JSON parse error: #{e.message.inspect}."
-        end
-
+        result&.error "JSON parse error: #{e.message.inspect}."
         return nil
       end
 
-
       def type_assertion_method
         :is_a?
       end