For RANAP specification :

  RANAP-ELEMENTARY-PROCEDURE ::= CLASS {
    &InitiatingMessage,
    &SuccessfulOutcome          OPTIONAL,
    &UnsuccessfulOutcome        OPTIONAL,
    &Outcome                    OPTIONAL,
    &procedureCode              ProcedureCode  UNIQUE,
    &criticality                Criticality    DEFAULT ignore
  } WITH SYNTAX {
    INITIATING MESSAGE          &InitiatingMessage
    [SUCCESSFUL OUTCOME         &SuccessfulOutcome]
    [UNSUCCESSFUL OUTCOME       &UnsuccessfulOutcome]
    [OUTCOME                    &Outcome]
    PROCEDURE CODE              &procedureCode
    [CRITICALITY                &criticality]
  }

Not all instances of elementary procedure have all their
optional members defined.

For examples :

  iu-Release RANAP-ELEMENTARY-PROCEDURE ::= {
    INITIATING MESSAGE  Iu-ReleaseCommand
    SUCCESSFUL OUTCOME  Iu-ReleaseComplete
    PROCEDURE CODE      id-Iu-Release
    CRITICALITY         reject
  }

  rAB-Assignment RANAP-ELEMENTARY-PROCEDURE ::= {
    INITIATING MESSAGE	RAB-AssignmentRequest
    OUTCOME             RAB-AssignmentResponse
    PROCEDURE CODE      id-RAB-Assignment
    CRITICALITY         reject
  }

So there are empty cells generated in Outcome.c ... etc.

  static const asn_ioc_cell_t asn_IOS_RANAP_ELEMENTARY_PROCEDURES_1_rows[] = {
    { "&InitiatingMessage", aioc__type, &asn_DEF_Iu_ReleaseCommand },
    { "&SuccessfulOutcome", aioc__type, &asn_DEF_Iu_ReleaseComplete },
    { "&UnsuccessfulOutcome",  },
    { "&Outcome",  },
    { "&procedureCode", aioc__value, &asn_DEF_ProcedureCode, &asn_VAL_1_id_Iu_Release },
    { "&criticality", aioc__value, &asn_DEF_Criticality, &asn_VAL_1_reject },

    { "&InitiatingMessage", aioc__type, &asn_DEF_RAB_AssignmentRequest },
    { "&SuccessfulOutcome",  },
    { "&UnsuccessfulOutcome",  },
    { "&Outcome", aioc__type, &asn_DEF_RAB_AssignmentResponse },
    { "&procedureCode", aioc__value, &asn_DEF_ProcedureCode, &asn_VAL_49_id_RAB_Assignment },
    { "&criticality", aioc__value, &asn_DEF_Criticality, &asn_VAL_49_reject }
  }

However, in type_selector() functions, these undefined cell are still
be counted into presence_index value. This results in wrong behavior for
decoder.

This commit is to fix this problem.