Error getting failed test output in IE11 without iframe

### Expected behavior

Output of a failed test in IE11 gets logged in the console.
### Actual behavior

An error is raised:

```
TypeError: result.suite.join is not a function
    at specFailure (/Users/kostia/Code/tmp/karma-ie-debug/node_modules/karma/lib/reporters/base.js:94:33)
    at onSpecComplete (/Users/kostia/Code/tmp/karma-ie-debug/node_modules/karma/lib/reporters/base.js:80:12)
    at null.<anonymous> (/Users/kostia/Code/tmp/karma-ie-debug/node_modules/karma/lib/events.js:13:22)
    at emitTwo (events.js:100:13)
    at emit (events.js:185:7)
    at onResult (/Users/kostia/Code/tmp/karma-ie-debug/node_modules/karma/lib/browser.js:216:13)
    at Array.forEach (native)
    at onResult (/Users/kostia/Code/tmp/karma-ie-debug/node_modules/karma/lib/browser.js:206:21)
    at Socket.<anonymous> (/Users/kostia/Code/tmp/karma-ie-debug/node_modules/karma/lib/events.js:13:22)
    at emitOne (events.js:95:20)
    at Socket.emit (events.js:182:7)
    at Socket.onevent (/Users/kostia/Code/tmp/karma-ie-debug/node_modules/socket.io/lib/socket.js:335:8)
    at Socket.onpacket (/Users/kostia/Code/tmp/karma-ie-debug/node_modules/socket.io/lib/socket.js:295:12)
    at Client.ondecoded (/Users/kostia/Code/tmp/karma-ie-debug/node_modules/socket.io/lib/client.js:193:14)
    at Decoder.Emitter.emit (/Users/kostia/Code/tmp/karma-ie-debug/node_modules/component-emitter/index.js:134:20)
    at Decoder.add (/Users/kostia/Code/tmp/karma-ie-debug/node_modules/socket.io-parser/index.js:247:12)
```
### Enviroment Details
- "jasmine": "2.4.1",
- "karma": "0.13.22"
- "karma-jasmine": "0.3.6"
- "karma-sauce-launcher": "0.3.0"
- `conf.js`

``` javascript
module.exports = function(config) {
  config.set({
    singleRun: true,
    frameworks: ['jasmine'],
    files: ['test_spec.js'],
    client: {
      useIframe: false
    },
    browsers: ['ie'],
    customLaunchers: {
      ie: {
        base: 'SauceLabs',
        os: 'Windows 7',
        browserName: 'internet explorer',
        version: '11'
      }
    },
    sauceLabs: {
      startConnect: false,
      tunnelIdentifier: process.env.SAUCELABS_TUNNEL_IDENTIFIER,
      testName: 'debug',
    },
  });
};
```
### Steps to reproduce the behaviour

Simply run a failing spec:

``` js
// test_spec.js
describe('when running failing specs on IE11', function() {
  it('raises an error while capturing test output', function() {
    expect(true).toBe(false);
  });
});
```

The crucial part it the switch `client.useIframe`. The error is only raise if the iframe is disabled as in my config.


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Error getting failed test output in IE11 without iframe #2061

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Error getting failed test output in IE11 without iframe #2061

Description

Expected behavior

Actual behavior

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Steps to reproduce the behaviour

Metadata

Metadata

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