Revert "[BUGFIX][QGIS Server] Joins was not reloaded if the layer is …

…in cache"

This reverts commit e0c281e.

src/server/qgsserverprojectparser.cpp

@@ -28,9 +28,6 @@
 #include "qgseditorwidgetregistry.h"
 #include "qgslayertreegroup.h"
 
-#include "qgslogger.h"
-#include "qgsmessagelog.h"
-
 #include <QDomDocument>
 #include <QFileInfo>
 #include <QStringList>
@@ -237,11 +234,8 @@ QgsMapLayer* QgsServerProjectParser::createLayerFromElement( const QDomElement&
     if ( !QgsMapLayerRegistry::instance()->mapLayer( id ) )
       QgsMapLayerRegistry::instance()->addMapLayer( layer, false, false );
     if ( layer->type() == QgsMapLayer::VectorLayer )
-    {
       addValueRelationLayersForLayer( dynamic_cast<QgsVectorLayer *>( layer ) );
-      // Reload joins and expression fields
-      layer->readLayerXML( const_cast<QDomElement&>( elem ) );
-    }
+
     return layer;
   }
 
@@ -1541,7 +1535,7 @@ void QgsServerProjectParser::addJoinLayersForElement( const QDomElement& layerEl
   {
     QString id = joinNodeList.at( i ).toElement().attribute( "joinLayerId" );
     QgsMapLayer* layer = mapLayerFromLayerId( id );
-    if ( layer && !QgsMapLayerRegistry::instance()->mapLayer( id ))
+    if ( layer )
     {
       QgsMapLayerRegistry::instance()->addMapLayer( layer, false, false );
     }