Fix rubocop violations

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/helpers/kerberos_spnego_helper.rb

@@ -46,7 +46,7 @@ module KerberosSpnegoHelper
     return unless krb_principal
 
     identity = ::Identity.find_by(provider: :kerberos, extern_uid: krb_principal)
-    identity.user if identity
+    identity&.user
   end
 
   # The Kerberos backend will translate spnego_token into a Kerberos

app/models/environment.rb

@@ -126,7 +126,7 @@ class Environment < ActiveRecord::Base
     return unless available?
 
     stop!
-    stop_action.play(current_user) if stop_action
+    stop_action&.play(current_user)
   end
 
   def actions_for(environment)

app/models/geo_node.rb

@@ -95,7 +95,7 @@ class GeoNode < ActiveRecord::Base
   end
 
   def update_dependents_attributes
-    self.geo_node_key.title = "Geo node: #{self.url}" if self.geo_node_key
+    self.geo_node_key&.title = "Geo node: #{self.url}"
 
     if self.primary?
       self.oauth_application = nil

app/models/project.rb

@@ -508,7 +508,7 @@ class Project < ActiveRecord::Base
   def reset_cache_and_import_attrs
     ProjectCacheWorker.perform_async(self.id)
 
-    self.import_data&.destroy if !mirror?
+    self.import_data&.destroy unless mirror?
   end
 
   def import_url=(value)

app/models/repository.rb

@@ -943,11 +943,8 @@ class Repository
     raise 'Invalid merge target' if our_commit.nil?
     raise 'Invalid merge source' if their_commit.nil?
 
-    GitOperationService.new(user, self).with_branch(
-      target_branch) do |start_commit|
-      if merge_request
-        merge_request.update(in_progress_merge_commit_sha: their_commit.oid)
-      end
+    GitOperationService.new(user, self).with_branch(target_branch) do |start_commit|
+      merge_request&.update(in_progress_merge_commit_sha: their_commit.oid)
 
       their_commit.oid
     end

app/services/issues/create_service.rb

@@ -15,7 +15,7 @@ module Issues
     def before_create(issuable)
       if @recaptcha_verified
         spam_log = current_user.spam_logs.find_by(id: @spam_log_id, title: issuable.title)
-        spam_log.update!(recaptcha_verified: true) if spam_log
+        spam_log&.update!(recaptcha_verified: true)
       else
         issuable.spam = spam_service.check(@api)
         issuable.spam_log = spam_service.spam_log

db/migrate/20160812054342_add_group_id_columns_to_protected_branch_access_levels.rb

@@ -20,9 +20,9 @@ class AddGroupIdColumnsToProtectedBranchAccessLevels < ActiveRecord::Migration
 
   def change
     add_column :protected_branch_merge_access_levels, :group_id, :integer
-    add_foreign_key :protected_branch_merge_access_levels, :namespaces, column: :group_id
+    add_foreign_key :protected_branch_merge_access_levels, :namespaces, column: :group_id # rubocop: disable Migration/AddConcurrentForeignKey
 
     add_column :protected_branch_push_access_levels, :group_id, :integer
-    add_foreign_key :protected_branch_push_access_levels, :namespaces, column: :group_id
+    add_foreign_key :protected_branch_push_access_levels, :namespaces, column: :group_id # rubocop: disable Migration/AddConcurrentForeignKey
   end
 end

db/migrate/20160916101334_add_approver_groups.rb

@@ -20,6 +20,6 @@ class AddApproverGroups < ActiveRecord::Migration
       t.index :group_id
     end
 
-    add_foreign_key :approver_groups, :namespaces, column: :group_id, on_delete: :cascade
+    add_foreign_key :approver_groups, :namespaces, column: :group_id, on_delete: :cascade # rubocop: disable Migration/AddConcurrentForeignKey
   end
 end