Unused optional access fields not well handled

STR:

• Try to edit an access with optional field
• Do not set the optional field in the edit access form
• Submit the form
• The following error is raised:

code: "INVALID_PARAMETERS", message: "Missing 'name' (nuser) or 'value' (undefined) for field", shortMessage: "Missing 'name' (nuser) or 'value' (undefined) for field"