SHA-2478 : Some Share features stop working if a site has description = null (#463)

- Fixed some sites FTLs that failed due to site description being null

remote-api/src/main/resources/alfresco/templates/webscripts/org/alfresco/repository/site/site-admin-sites.get.json.ftl

@@ -6,7 +6,11 @@
 	                "sitePreset" : "${item.siteInfo.sitePreset}",
 	                "shortName" : "${item.siteInfo.shortName}",
 	                "title" : "${item.siteInfo.title}",
+	                <#if item.siteInfo.description??>
 	                    "description" : "${item.siteInfo.description}",
+                    <#else>
+						"description" : "",
+					</#if>
 	                "createdDate" : "${xmldate(item.siteInfo.createdDate)}",
 	                "lastModifiedDate" : "${xmldate(item.siteInfo.lastModifiedDate)}",
 	                "visibility" : "${item.siteInfo.visibility}",

remote-api/src/main/resources/alfresco/templates/webscripts/org/alfresco/repository/site/site.lib.ftl

@@ -10,7 +10,11 @@
 	"sitePreset": "${site.sitePreset}",
 	"shortName": "${site.shortName}",
 	"title": "${site.title}",
+	<#if site.description??>
 		"description": "${site.description}",
+	<#else>
+		"description" : "",
+	</#if>
 	<#if site.node?exists>
 	"node": "${url.serviceContext + "/api/node/" + site.node.storeType + "/" + site.node.storeId + "/" + site.node.id}",
 	"tagScope": "${url.serviceContext + "/api/tagscopes/" + site.node.storeType + "/" + site.node.storeId + "/" + site.node.id}",