docs(config): Describe new property
docs(config): Describe new property

Describe the new `failOnEmptyTestSuite` configuration option.

ernsheong/karma,shirish87/karma,mprobst/karma,david-garcia-nete/karma,panrafal/karma,karma-runner/karma,kahwee/karma,panrafal/karma,ernsheong/karma,maksimr/karma,karma-runner/karma,karma-runner/karma,wesleycho/karma,karma-runner/karma,johnjbarton/karma,johnjbarton/karma,wesleycho/karma,Dignifiedquire/karma,maksimr/karma,panrafal/karma,maksimr/karma,shirish87/karma,johnjbarton/karma,Dignifiedquire/karma,kahwee/karma,ernsheong/karma,kahwee/karma,wesleycho/karma,Dignifiedquire/karma,johnjbarton/karma,mprobst/karma,mprobst/karma,shirish87/karma,kahwee/karma,david-garcia-nete/karma,wesleycho/karma,Dignifiedquire/karma,pedrotcaraujo/karma,pedrotcaraujo/karma,pedrotcaraujo/karma,david-garcia-nete/karma,pedrotcaraujo/karma