docs: newapi: Avoid empty <div>s when there is no description

The various objects we generate API for may have empty description in
which case an empty div would be generated when processing the API
description. As we're using XML output mode the generator would shorten
such divs to the non-pair empty element version, which doesn't work well
with HTML5 parsers requiring a pair tag for <div>

Avoid empty description <div> elements altogether by skipping it if the
description is empty.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>

docs/newapi.xsl

@@ -222,6 +222,19 @@
     </xsl:if>
   </xsl:template>
 
+  <xsl:template name="formattextdiv">
+    <xsl:param name="text"/>
+    <xsl:param name="divclass"/>
+
+    <xsl:if test="$text">
+      <div class="{$divclass}">
+        <xsl:call-template name="formattext">
+          <xsl:with-param name="text" select="$text"/>
+        </xsl:call-template>
+      </div>
+    </xsl:if>
+  </xsl:template>
+
   <xsl:template match="macro" mode="toc">
     <span class="directive">#define</span><xsl:text> </xsl:text>
     <a href="#{@name}"><xsl:value-of select="@name"/></a>
@@ -287,11 +300,10 @@
   <xsl:template match="typedef[@type = 'enum']">
     <xsl:variable name="name" select="string(@name)"/>
     <h3><a id="{$name}"><code><xsl:value-of select="$name"/></code></a></h3>
-    <div class="description">
-    <xsl:call-template name="formattext">
+    <xsl:call-template name="formattextdiv">
       <xsl:with-param name="text" select="info"/>
+      <xsl:with-param name="divclass">description</xsl:with-param>
     </xsl:call-template>
-    </div>
     <div class="api">
       <pre>
         <span class="keyword">enum</span><xsl:text> </xsl:text>
@@ -343,11 +355,10 @@
         <xsl:text>;</xsl:text>
       </pre>
     </div>
-    <div class="description">
-    <xsl:call-template name="formattext">
+    <xsl:call-template name="formattextdiv">
       <xsl:with-param name="text" select="info"/>
+      <xsl:with-param name="divclass">description</xsl:with-param>
     </xsl:call-template>
-    </div>
   </xsl:template>
 
   <xsl:template match="struct" mode="toc">
@@ -452,11 +463,11 @@
     <xsl:variable name="name" select="string(@name)"/>
     <h3><a id="{$name}"><code><xsl:value-of select="$name"/></code></a></h3>
     <pre class="api"><span class="directive">#define</span><xsl:text> </xsl:text><xsl:value-of select="$name"/></pre>
-    <div class="description">
-    <xsl:call-template name="formattext">
+    <xsl:call-template name="formattextdiv">
       <xsl:with-param name="text" select="info"/>
+      <xsl:with-param name="divclass">description</xsl:with-param>
     </xsl:call-template>
-    </div><xsl:text>
+    <xsl:text>
 </xsl:text>
   </xsl:template>
 
@@ -604,11 +615,10 @@
     <xsl:text>)
 </xsl:text>
     </pre>
-    <div class="description">
-    <xsl:call-template name="formattext">
+    <xsl:call-template name="formattextdiv">
       <xsl:with-param name="text" select="info"/>
+      <xsl:with-param name="divclass">description</xsl:with-param>
     </xsl:call-template>
-    </div>
     <xsl:if test="arg | return">
       <dl class="variablelist">
       <xsl:for-each select="arg">
@@ -680,11 +690,11 @@
     </xsl:for-each>
     <xsl:text>)</xsl:text>
     </pre>
-    <div class="description">
-    <xsl:call-template name="formattext">
+    <xsl:call-template name="formattextdiv">
       <xsl:with-param name="text" select="info"/>
+      <xsl:with-param name="divclass">description</xsl:with-param>
     </xsl:call-template>
-    </div><xsl:text>
+    <xsl:text>
 </xsl:text>
     <xsl:if test="arg | return/@info">
       <dl class="variablelist">