fix HtmlReporter error observed when only describe block added to spec

The below error is thrown when a spec only has "describe" block no "it" block, no real tests in the spec.
traced down to HtmlReporter,
added a null check before the function call.

TypeError: 'undefined' is not an object (evaluating 'reporterView.suiteComplete')
    at http://127.0.0.1:52047/jasmine-core/jasmine-html.js:92
    at http://127.0.0.1:52047/jasmine-core/jasmine.js:1788
    at http://127.0.0.1:52047/jasmine-core/jasmine.js:2475
    at http://127.0.0.1:52047/jasmine-core/jasmine.js:2522
    at http://127.0.0.1:52047/jasmine-core/jasmine.js:2106
    at http://127.0.0.1:52047/jasmine-core/jasmine.js:2049
    at http://127.0.0.1:52047/jasmine-core/jasmine.js:2523
    at http://127.0.0.1:52047/jasmine-core/jasmine.js:2096
    at http://127.0.0.1:52047/jasmine-core/jasmine.js:2049    at http://127.0.0.1:52047/jasmine-core/jasmine.js:2523
    at http://127.0.0.1:52047/jasmine-core/jasmine.js:2096
    at http://127.0.0.1:52047/jasmine-core/jasmine.js:2049
    at http://127.0.0.1:52047/jasmine-core/jasmine.js:2145
    at http://127.0.0.1:52047/jasmine-core/jasmine.js:802