OptionGroupSpecification field inputs are being set to null (v 2.1.1)

Behaviour:

• Create an Option Group input, e.g. Prefix. -- "Use label as value" can be Yes or No, doesn't matter.
• Use this input to update the Contact.

Outcome:

• The contact's Prefix value from the Option Group is not updated after the form processor runs.

Behaviour:

• The Runner's processInputs() method calls the following: $dataBag->setInputData($objInput, $inputType->normalizeValue($params[$input['name']]), $inputType);

• The value doesn't pass the checks in OptionGroupType::normalizeValue() and returns null.

• This null value is passed along in the $dataBag, so the OptionGroup value is never updated to the expected value.

• Caused by Commit e97bd719 "Fixed minor issue around calculations"

Agileware Ref: CIVICRM-2277