Unexpected error on empty pattern

[yrtimiD]

When patter isn't passed into constructor, plugin tries to report an error:
245 this.errors.push(plugin.errorMessages['no-pattern']);
but, at this point this.errors isn't assigned yet, and will be created only at
248 objectAssign(this, composedPlugin, instance(), opts);

as result, not very clear error is shown:

<redacted>\node_modules\license-webpack-plugin\index.js:245
    this.errors.push(plugin.errorMessages['no-pattern']);
               ^

TypeError: Cannot read property 'push' of undefined
    at new licensePlugin (<redacted>\node_modules\license-webpack-plugin\index.js:245:16)```

[xz64]

Thanks, fixed in 0.4.1