avoid warning about not created test difference image

(cherry picked from commit d40d481)

Author: jef-n

src/core/qgsrenderchecker.cpp

@@ -27,16 +27,16 @@
 #include <QDebug>
 #include <QBuffer>
 
-QgsRenderChecker::QgsRenderChecker() :
-    mReport( "" ),
-    mMatchTarget( 0 ),
-    mElapsedTime( 0 ),
-    mRenderedImageFile( "" ),
-    mExpectedImageFile( "" ),
-    mMismatchCount( 0 ),
-    mColorTolerance( 0 ),
-    mElapsedTimeTarget( 0 ),
-    mBufferDashMessages( false )
+QgsRenderChecker::QgsRenderChecker()
+    : mReport( "" )
+    , mMatchTarget( 0 )
+    , mElapsedTime( 0 )
+    , mRenderedImageFile( "" )
+    , mExpectedImageFile( "" )
+    , mMismatchCount( 0 )
+    , mColorTolerance( 0 )
+    , mElapsedTimeTarget( 0 )
+    , mBufferDashMessages( false )
 {
 }
 
@@ -359,7 +359,6 @@ bool QgsRenderChecker::compareImages( QString theTestName,
   //
   emitDashMessage( "Rendered Image " + theTestName + prefix, QgsDartMeasurement::ImagePng, mRenderedImageFile );
   emitDashMessage( "Expected Image " + theTestName + prefix, QgsDartMeasurement::ImagePng, mExpectedImageFile );
-  emitDashMessage( "Difference Image " + theTestName + prefix, QgsDartMeasurement::ImagePng, myDiffImageFile );
 
   //
   // Put the same info to debug too
@@ -430,6 +429,7 @@ bool QgsRenderChecker::compareImages( QString theTestName,
   //save the diff image to disk
   //
   myDifferenceImage.save( myDiffImageFile );
+  emitDashMessage( "Difference Image " + theTestName + prefix, QgsDartMeasurement::ImagePng, myDiffImageFile );
   delete maskImage;
 
   //

src/gui/qgscomposerruler.cpp

@@ -25,7 +25,7 @@ QgsComposerRuler::QgsComposerRuler( QgsComposerRuler::Direction d ) : QWidget( 0
   mRulerFont->setPointSize( RULER_FONT_SIZE );
   mRulerFontMetrics = new QFontMetrics( *mRulerFont );
 
-  //calculate ruler sizes and marker seperations
+  //calculate ruler sizes and marker separations
 
   //minimum gap required between major ticks is 3 digits * 250%, based on appearance
   mScaleMinPixelsWidth = mRulerFontMetrics->width( "000" ) * 2.5;
@@ -345,7 +345,7 @@ int QgsComposerRuler::optimumNumberDivisions( double rulerScale, int scaleMultip
   {
     //find pixel size for this small division
     double candidateSize = largeDivisionSize / ( *divisions_it );
-    //check if this seperation is more then allowed min seperation
+    //check if this separation is more then allowed min separation
     if ( candidateSize >= mMinPixelsPerDivision )
     {
       //found a good candidate, return it