Parsley - Error message being used over Required Message when field is empty

Question

I have added a custom validator to parsley which is working as expected but the only problem I have is that the data-parsley-error-message is being used over the data-parsley-required-message when the field has been left empty.

How can this be prevented so that the error message is used when validation fails and the required message is shown when the field is blank.

Current Code:

<input class="form-control" id="FirstName" name="FirstName" maxlength="20" data-parsley-required-message="Your first name was missing." data-parsley-validate-non-ascii="" data-parsley-error-message="Invalid Character Entered" data-parsley-trigger="blur" required="" data-parsley-id="3137" type="text">

 window.ParsleyValidator.addValidator('validateNonAscii', function (value) {
        return Validate(value);
    });

Answer 1

Using the suggestion from Marc-André Lafortune, I managed to find my own answer by implementing a custom Validation Error Message:

I updated my HTML input to the following:

<input type="text" class="form-control" id="FirstName" name="FirstName" maxlength="20" data-parsley-required-message="Your first name was missing." data-parsley-validate-non-ascii="" data-parsley-validate-non-ascii-message="Invalid Character Entered" data-parsley-trigger="blur" required="" data-parsley-id="5021">

Then using an event listener, I was able to add the error message from the input to Parsley; which now shows the validation error when a invalid character is entered and the required message when the field is blank.

$.listen('parsley:field:error', function (fieldInstance) {
    var validateNonAsciiMessage = fieldInstance.$element.data('parsley-validate-non-ascii-message');

    if (validateNonAsciiMessage !== undefined) {
        window.ParsleyValidator.addMessage('en', 'validateNonAscii', validateNonAsciiMessage);
    }
});

window.ParsleyValidator.addValidator('validateNonAscii', function (value) {
    return Validate(value);
});