How to remove all empty tag with conditons in XSL

I want to remove empty tags with exception.

I made an XSL to remove all empty tags with exception. Following the XSL below:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://ift.tt/tCZ8VR">
 <xsl:strip-space elements="*"/>
 <xsl:preserve-space elements="cEAN"/ priority="1">
 <xsl:template match="node()|@*">
   <xsl:copy>
      <xsl:apply-templates select="node()|@*"/>
  </xsl:copy>
</xsl:template>
<xsl:template match="*[not(@*) and not(*) and (not(text()) or .=-1)]"/>
</xsl:stylesheet>

When the XML following the rules below, it's working fine,

<?xml version="1.0" encoding="utf-8"?>
  <NFe xmlns:n0="http://mynamespace">
     <cProd>0000000000001</cProd>
     <cEAN> </cEAN>
     <xProd>ARV NAT</xProd>
     <NCM>01000</NCM>
     <CFOP>9999</CFOP>
     </uCom>
 </Nfe>

The transformation XML:

<?xml version="1.0" encoding="UTF-8"?>
<NFe xmlns:n0="http://mynamespace">
  <cProd>0000000000001</cProd>
  <cEAN />
  <xProd>ARV NAT</xProd>
  <NCM>01000</NCM>
  <CFOP>9999</CFOP>
</NFe> 

But when the XML following the rules below, Isn't work.

 <?xml version="1.0" encoding="utf-8"?>
  <NFe xmlns:n0="http://mynamespace">
     <cProd>0000000000001</cProd>
     <cEAN/>
     <xProd>ARV NAT</xProd>
     <NCM>01000</NCM>
     <CFOP>999</CFOP>
     <uCom/>
  </Nfe>

The transformation XML:

<?xml version="1.0" encoding="UTF-8"?>
<NFe xmlns:n0="http://mynamespace">
   <cProd>0000000000001</cProd>
   <xProd>ARV NAT</xProd>
   <NCM>01000</NCM>
   <CFOP>9999</CFOP>
</NFe>

The tag cEAN is not preserved and it's remove all empty tags.

Someone could help me?