Exception In Metrics When Using Flot Chart Style

[JimMichael]

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Trying to view a metric under Tools | Metrics can cause an exception if the Metric Detail block is configured to use Flot chart style instead of Rock style.## Expected Behavior
Metrics would not throw exception when using Flot chart style## Actual Behavior
They do## Steps to Reproduce

1. on rock.rocksolidchurchdemo.com go to Tools | Metrics
2. Click on Homepage Metrics | Active Connection Requests
3. Observe that the metric renders normally as expected.
4. Edit the Metric Detail block on the page and change the chart style from Rock to Flot
5. Refresh the page and click Homepage Metrics | Active Connection requests and observer the exception.

Here's the exception with debug enabled:

## Rock Version
15.0+## Client Culture Setting
en-US

[ethan-sparkdevnetwork]

Fixed in commit: bcb3a75