FIX: Improved custom state variable support #365
Merged
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This PR makes two small improvements to better support the use of custom state variable objects.
One change silences a callables warning that would occur every time a custom state variable was used; this has been improved to only warn when expected state variables are missing. The other change relaxes an implicit assumption / bug that state variables would never be equal to zero (when calculating a percent change in value); now we detect this case and switch to an absolute difference.