Guard against empty rules set #22
Merged
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This PR guards against an empty rules set as seen in #16.
To prevent things getting a bit hairy in the
IcalFitlerProxy#calendarsmethod, I've split that out into it's own builder class. This should also make it easier to add additional pieces of configuration such as required in #18.Once refactored, it was simply a case of adding a guard clause to
IcalFilterProxy::CalendarBuilder#add_rulesto prevent treating a nil as an array.