XSLT 1.0 - How to only copy elements with values, or descendents with values - xslt-1.0

Question

With XML like
<?xml version="1.0" encoding="utf-8"?>
<Products>
<Product>
<Sku />
<Suppliers>
<Supplier>
<Name />
</Supplier>
</Suppliers>
<Priority>1</Priority>
</Product>
<Product>
<Sku>123</Sku>
<Suppliers>
<Supplier>Jon</Supplier>
</Suppliers>
<Priority>3</Priority>
<e />
</Product>
</Products>
How to transform and only output if element has value, or descendent has a value?
(The 2nd 'filter template' filters empty, with match=*[not(node() )] , but only if no descendents)
<xsl:template match="node()|#*">
<xsl:copy>
<xsl:apply-templates select="node()|#*"/>
</xsl:copy>
</xsl:template>
<!-- When matching empty: do nothing -->
<xsl:template match="*[not(node())]">
<xsl:comment>filtering <xsl:value-of select="local-name()"/></xsl:comment>
</xsl:template>
Current output: (With debug-comments to identify names of filtered elements)
<?xml version="1.0" encoding="utf-8"?><Products>
<Product>
<!--filtering Sku-->
<Suppliers>
<Supplier>
<!--filtering Name-->
</Supplier>
</Suppliers>
<Priority>1</Priority>
</Product>
<Product>
<Sku>123</Sku>
<Suppliers>
<Supplier>Jon</Supplier>
</Suppliers>
<Priority>3</Priority>
<!--filtering e-->
</Product>
</Products>
Required output: (without comments)
<?xml version="1.0" encoding="utf-8"?><Products>
<Product>
<Priority>1</Priority>
</Product>
<Product>
<Sku>123</Sku>
<Suppliers>
<Supplier>Jon</Supplier>
</Suppliers>
<Priority>3</Priority>
</Product>
</Products>
Assume this requires a type of forward-look (recursive template?), to see if any descendents have a value, before copying element

Answer 1

Assuming that by "value" you mean a non whitespace-only text node, you could do simply:
XSLT 1.0
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:strip-space elements="*"/>
<!-- identity transform -->
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<!-- prune branches that do not carry fruit -->
<xsl:template match="*[not(descendant::text())]"/>
</xsl:stylesheet>