title: jquery inputmask with empty value submits 0.00 instead of empty string
body: <p>I am using jquery inputmask with with the latest version, downloaded today (v. 3.1.64-86).  </p>
  
  <p>I have a simple "OvertimeFee" text input and have setup the mask on it with the code below.</p>
  
  <pre><code>$('#OvertimeFee').inputmask('currency', {
      'autoUnmask': true,
      'removeMaskOnSubmit': true,
      'clearMaskOnLostFocus': true,
      'clearIncomplete': true,
      'prefix': '',
      'rightAlign': false,
      'showMaskOnHover': false
  });
  </code></pre>
  
  <p>No initial value is bound to it when the page is loaded, and user's are not required to fill the field when submitting the form</p>
  
  <p>The problem I am having is that whenever the user leaves the field blank or enters a value and then removes it, the form always submits "0.00" instead of an empty value ("").  I would like the form to always submit "" if the user didn't populate it, but I can't figure out how to make inputmask do that.  Even with autoUnmask and removeMaskOnSubmit set to true it still submits "0.00".</p>
  
  <p>Does anyone know how to pull this off?  I've had no luck searching the github issues.</p>
  
  <p>Thanks.</p>
  
  <p>FWIW, the scripts included and being used on the page are:</p>
  
  <pre><code>&lt;script src="~/Scripts/jquery-1.10.2.js"&gt;&lt;/script&gt;
  &lt;script src="~/Scripts/jquery.inputmask/inputmask.js"&gt;&lt;/script&gt;
  &lt;script src="~/Scripts/jquery.inputmask/jquery.inputmask.js"&gt;&lt;/script&gt;
  &lt;script src="~/Scripts/jquery.inputmask/inputmask.numeric.extensions.js"&gt;&lt;/script&gt;
  </code></pre>