Decode output and make sure you don't fail

DecodeNoFail.sol

contract ToBeExecuted {
    // Calling this method creates problems because it returns only 1 uint 
    // when 2 uint's are expected
    function toCall() public returns (uint) {
        return (1234);
    }
}

contract Executor {
    function call(address contract_) public returns (bool, bytes memory, bool, uint, uint) {
        // Low level call
        (bool ok, bytes memory response) = contract_.call(
            abi.encodeWithSignature("toCall()")
        );

        // Try to decode response
        try this.decodeResponse(response) returns (uint a_, uint b_) {
            return (ok, response, true, a_, b_);
        } catch {
            return (ok, response, false, 0, 0);
        }
    }

    function decodeResponse(bytes memory response) public view returns (uint, uint) {
        (uint a, uint b) = abi.decode(response, (uint, uint));
        return (a, b);
    }
}