fix bug: tabattach does'nt work correct.
fix bug: tabattach does'nt work correct.

Fixes issue 877
Update issue 877
Good catch. Thank you very much.

nullren/vimperator-labs,stemar94/vimperator-labs,Evidlo/vimperator-labs,derenio/vimperator-labs,Sheile/vimperator-labs,Sheile/vimperator-labs,mcarton/vimperator-labs,stemar94/vimperator-labs,Quicksaver/vimperator-labs,nullren/vimperator-labs,seanmorton/vimperator-labs,airodactyl/airodactyl,airodactyl/airodactyl,paretje/vimperator-labs,zklinger/vimperator-labs,paretje/vimperator-labs,Quicksaver/vimperator-labs,zklinger/vimperator-labs,derenio/vimperator-labs,seanmorton/vimperator-labs,Evidlo/vimperator-labs,mcarton/vimperator-labs