Ovale Spell Priority 6.2.3
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Changes from version 6.2.2:
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-   If maximum health can't be determined, then assume mob is at 100% health.

-   Silently handle nil unit IDs passed to UnitHealth() and UnitHealthMax().

    There are times when a mob has been tracked down to a GUID via a CLEU
    event, but it has no associated unit ID.  In that case, if the unit ID
    parameter is nil, then assume that the health is zero.
