Add after_initialize method to set defaults

- Required if we want build_project_incident_management_settings to have
values already set.

ee/app/models/incident_management/project_incident_management_setting.rb

@@ -6,8 +6,15 @@ module IncidentManagement
 
     validate :issue_template_exists, if: :create_issue?
 
+    after_initialize :set_defaults
+
     private
 
+    def set_defaults
+      self.send_email = true
+      self.create_issue = false
+    end
+
     def issue_template_exists
       return unless issue_template_key.present?
 

ee/app/services/projects/prometheus/alerts/notify_service.rb

@@ -23,9 +23,7 @@ module Projects
         def send_email?
           return true unless has_incident_management_license?
 
-          setting = project.incident_management_setting
-
-          return true if setting.nil?
+          setting = project.incident_management_setting || project.build_incident_management_setting
 
           setting.send_email
         end