Show "v." in cover only when version is not empty

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@116015 13f79535-47bb-0310-9956-ffa450edef68

pdf/src/plugin-resources/fo-cover.xslt

@@ -97,7 +97,10 @@
                                                 </fo:table-cell>
                                                 <fo:table-cell number-columns-spanned="2" xsl:use-attribute-sets="cover.border.left">
                                                     <fo:block xsl:use-attribute-sets="cover.title" text-align="left" display-align="center" space-after="0.5in">
-                                                        <xsl:value-of select="$coverProjectName"/> v.<xsl:value-of select="$coverVersion"/>
+                                                        <xsl:value-of select="$coverProjectName"/> 
+                                                        <xsl:if test="normalize-space($coverVersion) != ''">
+                                                                v.<xsl:value-of select="$coverVersion"/>
+                                                        </xsl:if>
                                                     </fo:block>
                                                 </fo:table-cell>
                                             </fo:table-row>