Improve error message when Python wasn't found for the browse tool
Improve error message when Python wasn't found for the browse tool

See #1306.

atetubou/ninja,sgraham/ninja,ninja-build/ninja,nico/ninja,nicolasdespres/ninja,sgraham/ninja,iwadon/ninja,mydongistiny/ninja,martine/ninja,ninja-build/ninja,iwadon/ninja,AoD314/ninja,martine/ninja,ninja-build/ninja,bradking/ninja,atetubou/ninja,maruel/ninja,martine/ninja,nico/ninja,mydongistiny/ninja,ninja-build/ninja,bradking/ninja,ndsol/subninja,sgraham/ninja,Qix-/ninja,iwadon/ninja,nicolasdespres/ninja,mydongistiny/ninja,maruel/ninja,ndsol/subninja,bradking/ninja,AoD314/ninja,sgraham/ninja,ndsol/subninja,nicolasdespres/ninja,AoD314/ninja,nico/ninja,nicolasdespres/ninja,atetubou/ninja,AoD314/ninja,martine/ninja,Qix-/ninja,maruel/ninja,Qix-/ninja,Qix-/ninja,ndsol/subninja,iwadon/ninja,maruel/ninja,atetubou/ninja,bradking/ninja,nico/ninja,mydongistiny/ninja