Minor Coverity fixes (null dereference, uninitialised members)

src/app/composer/qgscomposerlegendwidget.cpp

@@ -109,11 +109,11 @@ QgsComposerLegendWidget::QgsComposerLegendWidget( QgsComposerLegend* legend )
   mainLayout->addWidget( itemPropertiesWidget );
 
   mItemTreeView->setHeaderHidden( true );
-  mItemTreeView->setModel( legend->modelV2() );
-  mItemTreeView->setMenuProvider( new QgsComposerLegendMenuProvider( mItemTreeView, this ) );
 
   if ( legend )
   {
+    mItemTreeView->setModel( legend->modelV2() );
+    mItemTreeView->setMenuProvider( new QgsComposerLegendMenuProvider( mItemTreeView, this ) );
     connect( legend, SIGNAL( itemChanged() ), this, SLOT( setGuiElements() ) );
     mWrapCharLineEdit->setText( legend->wrapChar() );
   }

src/app/composer/qgscomposermapwidget.cpp

@@ -49,8 +49,6 @@ QgsComposerMapWidget::QgsComposerMapWidget( QgsComposerMap* composerMap )
 {
   setupUi( this );
 
-  mLabel->setText( tr( "Map %1" ).arg( composerMap->id() ) );
-
   //add widget for general composer item properties
   QgsComposerItemWidget* itemPropertiesWidget = new QgsComposerItemWidget( this, composerMap );
   mainLayout->addWidget( itemPropertiesWidget );
@@ -135,6 +133,8 @@ QgsComposerMapWidget::QgsComposerMapWidget( QgsComposerMap* composerMap )
 
   if ( composerMap )
   {
+    mLabel->setText( tr( "Map %1" ).arg( composerMap->id() ) );
+
     connect( composerMap, SIGNAL( itemChanged() ), this, SLOT( setGuiElementValues() ) );
 
     QgsAtlasComposition* atlas = atlasComposition();

src/app/qgslabelinggui.cpp

@@ -49,6 +49,14 @@ QgsLabelingGui::QgsLabelingGui( QgsVectorLayer* layer, QgsMapCanvas* mapCanvas,
     : QWidget( parent )
     , mLayer( layer )
     , mMapCanvas( mapCanvas )
+    , mCharDlg( 0 )
+    , mQuadrantBtnGrp( 0 )
+    , mDirectSymbBtnGrp( 0 )
+    , mUpsidedownBtnGrp( 0 )
+    , mPlacePointBtnGrp( 0 )
+    , mPlaceLineBtnGrp( 0 )
+    , mPlacePolygonBtnGrp( 0 )
+    , mPreviewSize( 24 )
     , mMinPixelLimit( 0 )
     , mLoadSvgParams( false )
 {
@@ -81,7 +89,6 @@ QgsLabelingGui::QgsLabelingGui( QgsVectorLayer* layer, QgsMapCanvas* mapCanvas,
   mCharDlg = new QgsCharacterSelectorDialog( this );
 
   mRefFont = lblFontPreview->font();
-  mPreviewSize = 24;
 
   // main layer label-enabling connections
   connect( chkEnableLabeling, SIGNAL( toggled( bool ) ), mFieldExpressionWidget, SLOT( setEnabled( bool ) ) );

src/core/composer/qgscomposerhtml.cpp

@@ -92,6 +92,7 @@ QgsComposerHtml::QgsComposerHtml()
     , mLoaded( false )
     , mHtmlUnitsToMM( 1.0 )
     , mRenderedPage( 0 )
+    , mEvaluateExpressions( true )
     , mUseSmartBreaks( true )
     , mMaxBreakDistance( 10 )
     , mExpressionFeature( 0 )