fmbtgti: fixed handling screenshot failures
fmbtgti: fixed handling screenshot failures

refreshScreenshot and its visual logging work even if
there would not be connection or taking screenshot fails.

mixu-/fMBT,rseymour/fMBT,rseymour/fMBT,giantpinkwalrus/fMBT,yoonkiss/fMBT,heivi/fMBT,pombreda/fMBT,rseymour/fMBT,giantpinkwalrus/fMBT,mixu-/fMBT,mlq/fMBT,01org/fMBT,mlq/fMBT,mixu-/fMBT,acozzette/fMBT,01org/fMBT,rseymour/fMBT,acozzette/fMBT,mlq/fMBT,rseymour/fMBT,rseymour/fMBT,giantpinkwalrus/fMBT,yoonkiss/fMBT,heivi/fMBT,violep01/fMBT,violep01/fMBT,acozzette/fMBT,heivi/fMBT,heivi/fMBT,01org/fMBT,yoonkiss/fMBT,heivi/fMBT,heivi/fMBT,yoonkiss/fMBT,pombreda/fMBT,acozzette/fMBT,acozzette/fMBT,violep01/fMBT,violep01/fMBT,01org/fMBT,heivi/fMBT,pombreda/fMBT,01org/fMBT,pombreda/fMBT,mixu-/fMBT,yoonkiss/fMBT,violep01/fMBT,pombreda/fMBT,mlq/fMBT,giantpinkwalrus/fMBT,pombreda/fMBT,giantpinkwalrus/fMBT,rseymour/fMBT,mlq/fMBT,pombreda/fMBT,mlq/fMBT,mlq/fMBT,mixu-/fMBT