Fix warning 'use uninitialized value' when env MANPATH is not defined
Fix warning 'use uninitialized value' when env MANPATH is not defined

calid/App-perlbrew,Asuza/App-perlbrew,josl/App-perlbrew,ptolemarch/App-perlbrew,ptolemarch/App-perlbrew,ptolemarch/App-perlbrew,rafl/App-perlbrew,josl/App-perlbrew,calid/App-perlbrew,josl/App-perlbrew,Asuza/App-perlbrew,rafl/App-perlbrew,rafl/App-perlbrew,Asuza/App-perlbrew