fix an issue with recognising attachements in TMail::Mail#has_attachments?
fix an issue with recognising attachements in TMail::Mail#has_attachments?

jubicoy/redmine_helpdesk,orchitech/redmine_helpdesk,eea/redmine_helpdesk,ekulos/redmine_helpdesk,eea/redmine_helpdesk,eea/redmine_helpdesk,VoronyukM/redmine_helpdesk,ekulos/redmine_helpdesk,orchitech/redmine_helpdesk,VoronyukM/redmine_helpdesk,ekulos/redmine_helpdesk,jfqd/redmine_helpdesk,jubicoy/redmine_helpdesk,jfqd/redmine_helpdesk