Improved error handling.

lib/search_index_backend.rb

@@ -12,6 +12,7 @@ info about used search index machine
 
   def self.info
     url = Setting.get('es_url').to_s
+    return if url.blank?
     Rails.logger.info "# curl -X GET \"#{url}\""
     response = UserAgent.get(
       url,

lib/tasks/search_index_es.rake

@@ -16,8 +16,12 @@ namespace :searchindex do
     puts 'create indexes...'
 
     # es with mapper-attachments plugin
-    number = SearchIndexBackend.info['version']['number'].to_s
-    if number =~ /^[2-4]\./ || number =~ /^5\.[0-5]\./
+    info = SearchIndexBackend.info
+    number = nil
+    if info.present?
+      number = info['version']['number'].to_s
+    end
+    if number.blank? || number =~ /^[2-4]\./ || number =~ /^5\.[0-5]\./
 
       # create indexes
       SearchIndexBackend.index(