Fix add_to_group and file type validation

lib/custom_wizard/actions.rb

@@ -106,7 +106,7 @@ class CustomWizard::Action
     end
   end
   
-  def open_composer   
+  def open_composer
     if action['custom_title_enabled']
       title = mapper.interpolate(action['custom_title'])
     else
@@ -138,7 +138,7 @@ class CustomWizard::Action
 
   def add_to_group
     groups = CustomWizard::Mapper.new(
-      inputs: action['inputs'],
+      inputs: action['group'],
       data: data,
       user: user,
       opts: {
@@ -167,7 +167,7 @@ class CustomWizard::Action
 
   def route_to
     url = mapper.interpolate(action['url'])
-    
+        
     if action['code']
       data[action['code']] = SecureRandom.hex(8)
       url += "&#{action['code']}=#{data[action['code']]}"

lib/custom_wizard/builder.rb

@@ -165,7 +165,7 @@ class CustomWizard::Builder
               end
             end
           end
-          
+                    
           if route_to = data['route_to']
             data.delete('route_to')
           end
@@ -305,7 +305,7 @@ class CustomWizard::Builder
       updater.fields[id] = standardise_boolean(value)
     end
     
-    if type === 'upload' && !validate_file_type(value, file_types)
+    if type === 'upload' && value.present? && !validate_file_type(value, file_types)
       updater.errors.add(id, I18n.t('wizard.field.invalid_file', label: label, types: file_types))
     end