MANPATH: unbound variable

[vitalymak]

I have such use-case when I try to load NVM but I don't have MANPATH environment variable set.

macOS 10.12.3

• nvm debug output:

nvm --version: v0.33.1
$SHELL: /bin/bash
$HOME: /Users/vitaly
$NVM_DIR: '$HOME/.nvm'
$PREFIX: ''
$NPM_CONFIG_PREFIX: ''
$NVM_NODEJS_ORG_MIRROR: 'https://nodejs.org/dist'
$NVM_IOJS_ORG_MIRROR: 'https://iojs.org/dist'
nvm current: v6.9.4
which node: $NVM_DIR/versions/node/v6.9.4/bin/node
which iojs:
which npm: $NVM_DIR/versions/node/v6.9.4/bin/npm
npm config get prefix: $NVM_DIR/versions/node/v6.9.4
npm root -g: $NVM_DIR/versions/node/v6.9.4/lib/node_modules

• What steps did you perform?

nvm deactivate
set -o nounset # unset variables are errors 
unset MANPATH
. ~/.nvm/nvm.sh

• What happened?

-bash: MANPATH: unbound variable

• What did you expect to happen?

Successful loading of NVM.

[ljharb]

Thanks for the report and the great repro steps!