empty commit message throws error

[devansvd]

Empty commit message throws error in the console. Should handle error and throws some kind of user friendly error message.

TypeError: Cannot read property 'length' of null
    at exports.default (./node_modules/@commitlint/rules/lib/header-max-length.js:10:143)
    at results.filter.map.entry (./node_modules/@commitlint/lint/lib/index.js:151:17)
    at Array.map (<anonymous>)
    at Object.<anonymous> (./node_modules/@commitlint/lint/lib/index.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:68:7)
husky > commit-msg hook failed (add --no-verify to bypass)

[escapedcat]

Duplicate of #615

[escapedcat]

PR not released yet I guess:
#676

Let's leave this open till it's released.