Hello, I use input like this:

 <div class="md-form md-outline">
    <input mdbInput type="text" class="form-control" id="'specificId" [placeholder]="field.placeholder">
    <label for="'specificId">{{ field.label }}</label>
</div>

When "field.placeholder" is set, it works great, but when it is null, it is marked "null" in the input and label is written in the top of the input. If "field.placeholder" = '' (empty string), placeholder is empty but label is written in the top of the input, not instead of placeholder. The field consider that there is a placeholder. How to deactivate it dynamically when "field.placeholder" is not set or null ?