[ios] Crash fix.
[ios] Crash fix.

Take a copy of pasteboard string since it can accidentally become nil while we still use it.

darina/omim,syershov/omim,rokuz/omim,65apps/omim,rokuz/omim,ygorshenin/omim,darina/omim,mapsme/omim,Transtech/omim,darina/omim,yunikkk/omim,stangls/omim,ygorshenin/omim,mgsergio/omim,goblinr/omim,mgsergio/omim,alexzatsepin/omim,VladiMihaylenko/omim,mapsme/omim,Zverik/omim,mgsergio/omim,milchakov/omim,goblinr/omim,syershov/omim,trashkalmar/omim,goblinr/omim,goblinr/omim,mgsergio/omim,yunikkk/omim,matsprea/omim,VladiMihaylenko/omim,65apps/omim,ygorshenin/omim,darina/omim,yunikkk/omim,darina/omim,trashkalmar/omim,trashkalmar/omim,mpimenov/omim,matsprea/omim,bykoianko/omim,bykoianko/omim,darina/omim,syershov/omim,65apps/omim,rokuz/omim,yunikkk/omim,stangls/omim,Zverik/omim,trashkalmar/omim,darina/omim,mpimenov/omim,darina/omim,darina/omim,dobriy-eeh/omim,mpimenov/omim,goblinr/omim,bykoianko/omim,Zverik/omim,65apps/omim,milchakov/omim,mapsme/omim,bykoianko/omim,rokuz/omim,mgsergio/omim,stangls/omim,mapsme/omim,mapsme/omim,milchakov/omim,rokuz/omim,milchakov/omim,dobriy-eeh/omim,yunikkk/omim,stangls/omim,mapsme/omim,milchakov/omim,mapsme/omim,matsprea/omim,bykoianko/omim,mpimenov/omim,rokuz/omim,syershov/omim,Transtech/omim,matsprea/omim,bykoianko/omim,dobriy-eeh/omim,trashkalmar/omim,bykoianko/omim,mpimenov/omim,goblinr/omim,rokuz/omim,dobriy-eeh/omim,darina/omim,stangls/omim,matsprea/omim,dobriy-eeh/omim,alexzatsepin/omim,rokuz/omim,dobriy-eeh/omim,goblinr/omim,syershov/omim,mapsme/omim,Transtech/omim,rokuz/omim,stangls/omim,VladiMihaylenko/omim,dobriy-eeh/omim,alexzatsepin/omim,mpimenov/omim,goblinr/omim,65apps/omim,alexzatsepin/omim,syershov/omim,mgsergio/omim,trashkalmar/omim,milchakov/omim,mpimenov/omim,goblinr/omim,65apps/omim,VladiMihaylenko/omim,dobriy-eeh/omim,rokuz/omim,VladiMihaylenko/omim,mgsergio/omim,darina/omim,VladiMihaylenko/omim,Zverik/omim,bykoianko/omim,Zverik/omim,ygorshenin/omim,VladiMihaylenko/omim,stangls/omim,ygorshenin/omim,syershov/omim,syershov/omim,ygorshenin/omim,mpimenov/omim,trashkalmar/omim,alexzatsepin/omim,darina/omim,syershov/omim,Transtech/omim,Zverik/omim,syershov/omim,65apps/omim,alexzatsepin/omim,alexzatsepin/omim,alexzatsepin/omim,Transtech/omim,mpimenov/omim,goblinr/omim,bykoianko/omim,milchakov/omim,Transtech/omim,dobriy-eeh/omim,trashkalmar/omim,stangls/omim,Zverik/omim,Transtech/omim,trashkalmar/omim,darina/omim,matsprea/omim,rokuz/omim,VladiMihaylenko/omim,yunikkk/omim,Zverik/omim,rokuz/omim,syershov/omim,VladiMihaylenko/omim,ygorshenin/omim,65apps/omim,matsprea/omim,Zverik/omim,bykoianko/omim,mpimenov/omim,mgsergio/omim,milchakov/omim,mpimenov/omim,mapsme/omim,milchakov/omim,mgsergio/omim,bykoianko/omim,VladiMihaylenko/omim,65apps/omim,stangls/omim,goblinr/omim,ygorshenin/omim,Zverik/omim,syershov/omim,matsprea/omim,Transtech/omim,dobriy-eeh/omim,alexzatsepin/omim,Transtech/omim,milchakov/omim,yunikkk/omim,Transtech/omim,dobriy-eeh/omim,milchakov/omim,Zverik/omim,mapsme/omim,mapsme/omim,bykoianko/omim,mgsergio/omim,mapsme/omim,ygorshenin/omim,ygorshenin/omim,mgsergio/omim,yunikkk/omim,Transtech/omim,ygorshenin/omim,VladiMihaylenko/omim,alexzatsepin/omim,yunikkk/omim,goblinr/omim,milchakov/omim,mpimenov/omim,alexzatsepin/omim,mapsme/omim,alexzatsepin/omim,stangls/omim,bykoianko/omim,65apps/omim,trashkalmar/omim,stangls/omim,matsprea/omim,alexzatsepin/omim,rokuz/omim,milchakov/omim,VladiMihaylenko/omim,yunikkk/omim,syershov/omim,mpimenov/omim,65apps/omim,Zverik/omim,goblinr/omim,matsprea/omim,mgsergio/omim,trashkalmar/omim,dobriy-eeh/omim,dobriy-eeh/omim,Transtech/omim,trashkalmar/omim,Zverik/omim,ygorshenin/omim,VladiMihaylenko/omim,yunikkk/omim