Fixed del to allow deletion of falsy values in array

[ftliou]

Modified del API to allow deletion of falsy values in array item.
Before: del([''], 0)).to.deep.equal([''])
After: del([''], 0)).to.deep.equal([])

[coveralls]

Coverage increased (+0.007%) to 98.951% when pulling 893c0be on ftliou:fix-del into 0df5e92 on mariocasciaro:master.

[coveralls]

Coverage increased (+0.007%) to 98.951% when pulling 893c0be on ftliou:fix-del into 0df5e92 on mariocasciaro:master.

[mariocasciaro]

Thanks for the PR! Could you please fix the linting errors, please, so the build doesn't fail?

[coveralls]

Coverage increased (+0.007%) to 98.951% when pulling 9a2fb0a on ftliou:fix-del into 0df5e92 on mariocasciaro:master.

[coveralls]

Coverage increased (+0.007%) to 98.951% when pulling 9a2fb0a on ftliou:fix-del into 0df5e92 on mariocasciaro:master.

[ftliou]

Oops sorry. Done :)

[mariocasciaro]

Thanks a lot!!!