getDealActivation(dealID) will revert the contract if the deal is expired

[ottpeter]

getDealActivation(dealID) will revert the contract if the deal is expired.

This is the comment above the function:

/// @notice Fetches activation state for a deal.
/// @notice This will be available from when the proposal is published until an undefined period after the deal finishes (either normally or by termination).
/// @return USR_NOT_FOUND if the deal doesn't exist (yet), or EX_DEAL_EXPIRED if the deal has been removed from state.

By this, I'm assuming that I can get a return value when the deal expired, including that scenario when the start epoch past before the sealing was done.

This is the return type of the function:

struct GetDealActivationReturn {
    int64 activated;
    int64 terminated;a
}

I don't know how this function would signal if the deal expired. If it is not the intended behavior that it is signaling that the deal expired, then I don't know how I should check first whether the deal is expired or not, so the smart contract call does not fail.

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