feat: Move Hidden flag of Portlet - MEED-6202 - Meeds-io/MIPs#120 (#874)

This change will move the 'hidden' class to parent element of portlet
instead of the child element to ensure to not have grid gap applied when
the application is added in a dynamic of fixed section.

web/portal/src/main/webapp/groovy/portal/webui/application/UIPortlet.gtmpl

@@ -46,6 +46,10 @@
 		<%} %>
 <%
 	}
+  String hiddenClass = "";
+  if(editMode == EditMode.NO_EDIT && (portletContent == null || org.apache.commons.lang3.StringUtils.isBlank(portletContent.toString()))) {
+    hiddenClass = "hidden";
+  }
 
 	if (editMode != EditMode.BLOCK) {
 		if(uicomponent.getShowInfoBar()) {
@@ -165,13 +169,9 @@
 			{
 				cssStyle += "height: "+ windowHeight +";";
 			}
-			String hiddenClass = "";
-			if(portletContent == null || org.apache.commons.lang3.StringUtils.isBlank(portletContent.toString())) {
-			  hiddenClass = "hidden";
-			}
  %>
- 				<div id="<%=editMode == EditMode.NO_EDIT ? portletId : "EditMode-"+ portletId%>">
-					<div class="PORTLET-FRAGMENT $hiddenClass" style="${cssStyle}">
+ 				<div id="<%=editMode == EditMode.NO_EDIT ? portletId : "EditMode-"+ portletId%>" class="$hiddenClass">
+					<div class="PORTLET-FRAGMENT" style="${cssStyle}">
  						<% 
 							if(hasAccessPermission)
               {