fix: npm ls --parseable --long output

[ruyadorno]

Fixes npm ls --parseable --long printing undefined next to all items.

Test

# Given a project structure:
ruyadorno@macbookpro ~/Documents/workspace/tmp \tree
.
├── c
│   └── package.json
├── node_modules
│   ├── a
│   │   └── package.json
│   ├── b
│   │   └── package.json
│   ├── c -> /Users/ruyadorno/Documents/workspace/tmp/c/
│   └── d
│       └── package.json
└── package.json

6 directories, 5 files

# BEFORE
ruyadorno@macbookpro ~/Documents/workspace/tmp npm6 ls --parseable --long
/Users/ruyadorno/Documents/workspace/tmp:[email protected]:undefined
/Users/ruyadorno/Documents/workspace/tmp/node_modules/a:[email protected]:undefined
/Users/ruyadorno/Documents/workspace/tmp/node_modules/b:[email protected]:undefined
/Users/ruyadorno/Documents/workspace/tmp/node_modules/c:[email protected]:undefined
/Users/ruyadorno/Documents/workspace/tmp/node_modules/d:[email protected]:undefined
/Users/ruyadorno/Documents/workspace/tmp/node_modules/f:f@"^2.0.0":INVALID:MISSING

# AFTER
ruyadorno@macbookpro ~/Documents/workspace/tmp node ~/Documents/workspace/cli/latest ls --parseable --long
/Users/ruyadorno/Documents/workspace/tmp:[email protected]
/Users/ruyadorno/Documents/workspace/tmp/node_modules/a:[email protected]
/Users/ruyadorno/Documents/workspace/tmp/node_modules/b:[email protected]
/Users/ruyadorno/Documents/workspace/tmp/node_modules/c:[email protected]:/Users/ruyadorno/Documents/workspace/tmp/c
/Users/ruyadorno/Documents/workspace/tmp/node_modules/d:[email protected]
/Users/ruyadorno/Documents/workspace/tmp/node_modules/f:f@"^2.0.0":INVALID:MISSING