add if no text in new metadata

gfl-plugin/src/main/resources/gfl-indexer.xslt

@@ -571,19 +571,39 @@ Refer to comments in the code to understand the used algorithm.
                <xsl:text disable-output-escaping="yes">]]&gt;</xsl:text>
             </field>
             <field name="institution">
-               <xsl:value-of select="//repository/normalize-space()"/><xsl:text>, </xsl:text>
-               <xsl:value-of select="//institution/normalize-space()"/><xsl:text>, </xsl:text>
-               <xsl:value-of select="//settlement/normalize-space()"/><xsl:text> (</xsl:text>
-               <xsl:value-of select="//country/normalize-space()"/><xsl:text>)</xsl:text>
+               <xsl:if test="//repository != '' ">
+                  <xsl:value-of select="//repository/normalize-space()"/><xsl:text>, </xsl:text>
+               </xsl:if>
+               <xsl:if test="//institution != '' ">
+                  <xsl:value-of select="//institution/normalize-space()"/><xsl:text>, </xsl:text>
+               </xsl:if>
+               <xsl:if test="//settlement != '' ">
+                  <xsl:value-of select="//settlement/normalize-space()"/>
+               </xsl:if>
+               <xsl:if test="//country != '' ">
+                  <xsl:text> (</xsl:text>
+                  <xsl:value-of select="//country/normalize-space()"/><xsl:text>)</xsl:text>
+               </xsl:if>
             </field>
             <field name="shelfmark">
                <xsl:value-of select="//idno/normalize-space()"/>
             </field>
             <field name="script_source">
-               <xsl:value-of select="//supportDesc/extent/text()"/><xsl:text>; </xsl:text>
-               <xsl:value-of select="//supportDesc/extent/dimensions/height/normalize-space()"/><xsl:text> x </xsl:text>
-               <xsl:value-of select="//supportDesc/extent/dimensions/width/normalize-space()"/><xsl:text> </xsl:text><xsl:value-of select="//supportDesc/extent/dimensions/@unit/normalize-space()"/><xsl:text>. </xsl:text>
-               <xsl:value-of select="//bindingDesc/normalize-space()"/>
+               <xsl:if test="//supportDesc/extent/text() != '' ">
+                  <xsl:value-of select="//supportDesc/extent/text()"/>
+               </xsl:if>
+               <xsl:if test="//supportDesc/extent/dimensions/height != ''">
+                  <xsl:value-of select="//supportDesc/extent/dimensions/height/normalize-space()"/><xsl:text> x </xsl:text>
+               </xsl:if>
+               <xsl:if test="//supportDesc/extent/dimensions/width != ''">
+                  <xsl:value-of select="//supportDesc/extent/dimensions/width/normalize-space()"/><xsl:text> </xsl:text>
+               </xsl:if>
+               <xsl:if test="//supportDesc/extent/dimensions/@unit">
+                  <xsl:value-of select="//supportDesc/extent/dimensions/@unit/normalize-space()"/><xsl:text>. </xsl:text>
+               </xsl:if>
+               <xsl:if test="//bindingDesc != ''">
+                  <xsl:value-of select="//bindingDesc/normalize-space()"/>
+               </xsl:if>
             </field>
             <xsl:for-each select="//handNote">
             <field name="writer">