Fixed issue#374. Delete cache in initial setup routine - script/scheduler.rb crashes after recreation of Zammad database.

db/migrate/20120101000001_create_base.rb

@@ -1,6 +1,9 @@
 class CreateBase < ActiveRecord::Migration
   def up
 
+    # clear old caches to start from scratch
+    Cache.clear
+
     create_table :sessions do |t|
       t.string :session_id,  null: false
       t.boolean :persistent, null: true

db/seeds.rb

@@ -6,6 +6,10 @@
 #
 #   cities = City.create([{ :name => 'Chicago' }, { :name => 'Copenhagen' }])
 #   Mayor.create(:name => 'Emanuel', :city => cities.first)
+
+# clear old caches to start from scratch
+Cache.clear
+
 Setting.create_if_not_exists(
   title: 'System Init Done',
   name: 'system_init_done',