API Key: Add utility method for checking it is set #404
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Description
Add utility method for checking the API key is saved in the
parsely
options, and a second utility method for checking if it is missing.Adds a third utility method for retrieving the API key.
Includes unit tests.
In the future, these methods may be moved to a Parsely_Options or similar class.
Motivation and Context
These methods can be used by various other classes and methods to see if this key trigger of behaviour changes is available, and provides the key as needed.
Closes #395.
How Has This Been Tested?
Integration tests pass, and work on #406 which utilises the new methods.
Screenshots (if appropriate):