[py] Don't write to unused pipe when no log_file (#2994)
[py] Don't write to unused pipe when no log_file (#2994)


davehunt/selenium,DrMarcII/selenium,SeleniumHQ/selenium,tbeadle/selenium,xmhubj/selenium,Tom-Trumper/selenium,markodolancic/selenium,krmahadevan/selenium,Herst/selenium,Jarob22/selenium,HtmlUnit/selenium,GorK-ChO/selenium,Ardesco/selenium,chrisblock/selenium,carlosroh/selenium,markodolancic/selenium,5hawnknight/selenium,oddui/selenium,jabbrwcky/selenium,joshmgrant/selenium,valfirst/selenium,TikhomirovSergey/selenium,asashour/selenium,bayandin/selenium,DrMarcII/selenium,valfirst/selenium,twalpole/selenium,mach6/selenium,xmhubj/selenium,bayandin/selenium,SeleniumHQ/selenium,chrisblock/selenium,TikhomirovSergey/selenium,xmhubj/selenium,Jarob22/selenium,5hawnknight/selenium,oddui/selenium,dibagga/selenium,dibagga/selenium,Tom-Trumper/selenium,valfirst/selenium,gurayinan/selenium,titusfortner/selenium,Tom-Trumper/selenium,Ardesco/selenium,dibagga/selenium,davehunt/selenium,titusfortner/selenium,titusfortner/selenium,Ardesco/selenium,tbeadle/selenium,asashour/selenium,joshmgrant/selenium,juangj/selenium,mojwang/selenium,jsakamoto/selenium,5hawnknight/selenium,asashour/selenium,Dude-X/selenium,valfirst/selenium,SeleniumHQ/selenium,davehunt/selenium,juangj/selenium,Dude-X/selenium,carlosroh/selenium,asashour/selenium,mojwang/selenium,titusfortner/selenium,davehunt/selenium,mojwang/selenium,carlosroh/selenium,davehunt/selenium,HtmlUnit/selenium,asolntsev/selenium,Dude-X/selenium,jabbrwcky/selenium,gurayinan/selenium,asolntsev/selenium,kalyanjvn1/selenium,titusfortner/selenium,Herst/selenium,5hawnknight/selenium,chrisblock/selenium,jabbrwcky/selenium,carlosroh/selenium,twalpole/selenium,gurayinan/selenium,tbeadle/selenium,mojwang/selenium,jsakamoto/selenium,Dude-X/selenium,krmahadevan/selenium,TikhomirovSergey/selenium,bayandin/selenium,HtmlUnit/selenium,markodolancic/selenium,davehunt/selenium,valfirst/selenium,mach6/selenium,GorK-ChO/selenium,xmhubj/selenium,juangj/selenium,TikhomirovSergey/selenium,Ardesco/selenium,titusfortner/selenium,joshbruning/selenium,Dude-X/selenium,HtmlUnit/selenium,asolntsev/selenium,tbeadle/selenium,Ardesco/selenium,asolntsev/selenium,xsyntrex/selenium,Dude-X/selenium,jabbrwcky/selenium,tbeadle/selenium,HtmlUnit/selenium,juangj/selenium,oddui/selenium,titusfortner/selenium,jsakamoto/selenium,5hawnknight/selenium,tbeadle/selenium,chrisblock/selenium,krmahadevan/selenium,SeleniumHQ/selenium,chrisblock/selenium,5hawnknight/selenium,Tom-Trumper/selenium,asashour/selenium,lmtierney/selenium,Jarob22/selenium,Jarob22/selenium,Herst/selenium,markodolancic/selenium,titusfortner/selenium,SeleniumHQ/selenium,lmtierney/selenium,asashour/selenium,juangj/selenium,dibagga/selenium,davehunt/selenium,gurayinan/selenium,lmtierney/selenium,SeleniumHQ/selenium,GorK-ChO/selenium,xsyntrex/selenium,twalpole/selenium,kalyanjvn1/selenium,valfirst/selenium,markodolancic/selenium,Jarob22/selenium,DrMarcII/selenium,asashour/selenium,Herst/selenium,twalpole/selenium,juangj/selenium,markodolancic/selenium,chrisblock/selenium,Herst/selenium,asolntsev/selenium,markodolancic/selenium,carlosroh/selenium,joshmgrant/selenium,Dude-X/selenium,joshmgrant/selenium,joshbruning/selenium,chrisblock/selenium,jsakamoto/selenium,mach6/selenium,valfirst/selenium,oddui/selenium,lmtierney/selenium,carlosroh/selenium,mach6/selenium,SeleniumHQ/selenium,jsakamoto/selenium,jabbrwcky/selenium,jsakamoto/selenium,SeleniumHQ/selenium,Ardesco/selenium,titusfortner/selenium,xsyntrex/selenium,lmtierney/selenium,jabbrwcky/selenium,HtmlUnit/selenium,dibagga/selenium,xmhubj/selenium,joshbruning/selenium,bayandin/selenium,GorK-ChO/selenium,DrMarcII/selenium,gurayinan/selenium,joshmgrant/selenium,Ardesco/selenium,gurayinan/selenium,oddui/selenium,dibagga/selenium,gurayinan/selenium,DrMarcII/selenium,lmtierney/selenium,valfirst/selenium,twalpole/selenium,twalpole/selenium,GorK-ChO/selenium,lmtierney/selenium,joshmgrant/selenium,davehunt/selenium,mach6/selenium,kalyanjvn1/selenium,bayandin/selenium,jabbrwcky/selenium,chrisblock/selenium,GorK-ChO/selenium,xsyntrex/selenium,carlosroh/selenium,Ardesco/selenium,5hawnknight/selenium,TikhomirovSergey/selenium,joshmgrant/selenium,xmhubj/selenium,joshmgrant/selenium,TikhomirovSergey/selenium,mojwang/selenium,asashour/selenium,juangj/selenium,markodolancic/selenium,oddui/selenium,oddui/selenium,Jarob22/selenium,mach6/selenium,xsyntrex/selenium,lmtierney/selenium,joshmgrant/selenium,asolntsev/selenium,Tom-Trumper/selenium,carlosroh/selenium,krmahadevan/selenium,DrMarcII/selenium,bayandin/selenium,xmhubj/selenium,xsyntrex/selenium,joshmgrant/selenium,krmahadevan/selenium,DrMarcII/selenium,Herst/selenium,SeleniumHQ/selenium,kalyanjvn1/selenium,5hawnknight/selenium,dibagga/selenium,Tom-Trumper/selenium,bayandin/selenium,joshbruning/selenium,Ardesco/selenium,kalyanjvn1/selenium,xsyntrex/selenium,krmahadevan/selenium,joshmgrant/selenium,markodolancic/selenium,GorK-ChO/selenium,Herst/selenium,TikhomirovSergey/selenium,gurayinan/selenium,HtmlUnit/selenium,twalpole/selenium,HtmlUnit/selenium,Jarob22/selenium,tbeadle/sele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