fix export excel bug caused by related to more than one members

app/views/admin/journal_papers/download_excel.xlsx.axlsx

@@ -60,7 +60,7 @@ wb = xlsx_package.workbook
     sheet.add_row row, :style => heading
 
     data.each do |jp|
-      row = [jp.member_profile.name]
+      row = [(jp.member_profile_id.class == Array ? jp.member_profile_id.map{|member_id| MemberProfile.find(member_id).name rescue ""} : [jp.member_profile.name])]
       @site_in_use_locales.each do |locale|
         row << jp.paper_title_translations[locale.to_s]
       end