Browser GRASS multilayer map fix

Author: blazek

src/core/qgsdataitem.cpp

@@ -493,6 +493,7 @@ void QgsDataItem::setParent( QgsDataItem* parent )
 
 void QgsDataItem::addChildItem( QgsDataItem * child, bool refresh )
 {
+  Q_ASSERT( child );
   QgsDebugMsg( QString( "path = %1 add child #%2 - %3 - %4" ).arg( mPath ).arg( mChildren.size() ).arg( child->mName ).arg( child->mType ) );
 
   int i;
@@ -551,6 +552,7 @@ int QgsDataItem::findItem( QVector<QgsDataItem*> items, QgsDataItem * item )
 {
   for ( int i = 0; i < items.size(); i++ )
   {
+    Q_ASSERT_X( items[i], "findItem", QString( "item %1 is NULL" ).arg( i ).toAscii() );
     QgsDebugMsgLevel( QString::number( i ) + " : " + items[i]->mPath + " x " + item->mPath, 2 );
     if ( items[i]->equal( item ) )
       return i;

src/providers/grass/qgsgrassprovidermodule.cpp

@@ -117,21 +117,24 @@ QVector<QgsDataItem*> QgsGrassMapsetItem::createChildren()
         layerType = QgsLayerItem::Polygon;
 
       QString layerPath = mapPath + QDir::separator() + layerName;
-      if ( layerNames.size() == 1 )
+      if ( !map )
       {
         /* This may happen (one layer only) in GRASS 7 with points (no topo layers) */
         QgsLayerItem *layer = new QgsLayerItem( this, name + " " + baseLayerName, layerPath, uri, layerType, "grass" );
         layer->setState( Populated );
         items.append( layer );
       }
-      else if ( map )
+      else
       {
         QgsLayerItem *layer = new QgsGrassVectorLayerItem( map, name, baseLayerName, layerPath, uri, layerType, "grass" );
         map->addChild( layer );
       }
     }
-    if ( layerNames.size() != 1 )
+    if ( map )
+    {
+      map->setState( Populated );
       items.append( map );
+    }
   }
 
   QStringList rasterNames = QgsGrass::rasters( mDirPath );