Cannot Read Base64 Encoded Message with Queue Trigger

#### Investigative information

Please provide the following:

- Timestamp: 12:30p, 12/12/2018
- Function App version (1.0 or 2.0): 2.0 (Public Preview)
- Function App name: QueueTrigger (unpublished), ReadFromStorage(unpublished)
- Function name(s) (as appropriate): __init__.py

Please note: The functions are not published yet.

#### Repro steps

Provide the steps required to reproduce the problem:

1) Create a function to insert a json string into Functions in Python. The code for the insertion should look like this:

```import base64

queue_name = "example"

queue_service = QueueService(account_name = "sample", account_key = "sample")

datapoint = json.dumps({"date": "123", "location" : "somewhere"})

datapoint = base64.b64encode(bytes(datapoint, 'utf-8'))

queue_service.put_message(queue_name, str(datapoint))
```

2) Execute the function successfully.

3) Create another function for queue triggers.
```
def main(msg: func.QueueMessage) -> None:
logging.info(msg.get_body.decode('utf-8')
```

#### Expected behavior

The function in 3) executes, showing all the queue messages.

#### Actual behavior

The function in 3) fails with the following error:


#### Known workarounds

None

#### Related information

Provide any related information

* Programming language used: Python
* Bindings used: Queues for the second function. Blobs for the first. Both are input bindings.

The issue provides a Python queue-trigger reproduction in __init__.py but names no repository files or tests. Start by reproducing the failure with the shown queue message and examining the queue binding behavior; done means the trigger can read and log the message as expected.

Written by the indexing model from the issue text.