fix page count when paginator is none

(cherry picked from commit 48eaa02)

Author: zfben

lib/jsonapi/processor.rb

@@ -96,7 +96,7 @@ def find
       end
 
       if (JSONAPI.configuration.top_level_meta_include_page_count && page_options[:record_count])
-        page_options[:page_count] = paginator.calculate_page_count(page_options[:record_count])
+        page_options[:page_count] = paginator ? paginator.calculate_page_count(page_options[:record_count]) : 1
       end
 
       if JSONAPI.configuration.top_level_links_include_pagination && paginator