Fix invalid $_SERVER user agent access
Fix invalid $_SERVER user agent access

Use the request service method that validate that property indeed exist
before accessing it

bordar/mwEmbed,tanyaLibatter/mwEmbed,omridevk/mwEmbed,kaltura/mwEmbed,omridevk/mwEmbed,tanyaLibatter/mwEmbed,FlixMaster/mwEmbed,alexmilk/mwEmbed,bordar/mwEmbed,kaltura/mwEmbed,kaltura/mwEmbed,alexmilk/mwEmbed,panda-os/mwEmbed,omridevk/mwEmbed,panda-os/mwEmbed,slash851/mwEmbed,panda-os/mwEmbed,bordar/mwEmbed,alexmilk/mwEmbed,FlixMaster/mwEmbed,tanyaLibatter/mwEmbed,FlixMaster/mwEmbed,slash851/mwEmbed,slash851/mwEmbed,tanyaLibatter/mwEmbed,FlixMaster/mwEmbed,omridevk/mwEmbed,panda-os/mwEmbed,alexmilk/mwEmbed,kaltura/mwEmbed,slash851/mwEmbed,bordar/mwEmbed