fix(allevents): update decode logic to handle no topics

[marcusmolchany]

the default for data.topics on line 53 was causing an exception on line 55:

TypeError: Cannot read property 'slice' of undefined

[coveralls]

Coverage decreased (-0.1%) to 90.534% when pulling 299bb03 on marcusmolchany:marcusmolchany/allevents-decode into 3547be3 on ethereum:develop.

[marcusmolchany]

not sure the best way to add tests for this one

[frozeman]

A test case would be great. There should be some decoder tests, just add one with empty data, or create a new unit test for that. Thanks for the find though!

[marcusmolchany]

@frozeman I just added a new test file. Do you know what type this._json is meant to be? An array prototype method is being used here, and that is failing my tests. I'm passing in the same json from the test data in event.decode.js.

Also wanted to note down that the same bug exists in this file, I can make another PR for that.

[frozeman]

Thanks for the fix, i'll fix the other one myself.

[frozeman]

The this._json is the jsonInterface of the contract which will fire this event. its needed to decode the event.

[marcusmolchany]

thanks!