Fix RuboCop alerts

Author: blocknotes

lib/activeadmin/views/activeadmin_form.rb

@@ -22,7 +22,7 @@ def readonly( field, value = nil, options = {} )
     cl = 'readonly-field'
     cl += " #{options[:class]}" if options[:class]
     li class: cl do
-      if !field.blank?
+      if field.present?
         label field, for: nil, class: 'field_label'
       else
         span ' '.html_safe, class: 'field_label'

spec/system/theme_spec.rb

@@ -8,8 +8,8 @@
     expect(page).to have_css('body.active_admin a', text: /new post/i, style: { 'background-image': 'none' })
     expect(page).to have_css('body.active_admin #header', style: { 'background-image': 'none' })
     expect(page).to have_css('body.active_admin #title_bar', style: { 'box-shadow': 'none' })
-    expect(page).to have_css('body.active_admin #main_content', style: { 'padding': '25px 20px' })
-    expect(page).to have_css('body.active_admin #active_admin_content', style: { 'display': 'flex' })
-    expect(page).to have_css('body.active_admin #footer', style: { 'position': 'absolute' })
+    expect(page).to have_css('body.active_admin #main_content', style: { padding: '25px 20px' })
+    expect(page).to have_css('body.active_admin #active_admin_content', style: { display: 'flex' })
+    expect(page).to have_css('body.active_admin #footer', style: { position: 'absolute' })
   end
 end