[layouts] Fix computation of atlas rectangle for rotated map items wh…

…en no atlas geometry available

src/core/layout/qgslayoutitemmap.cpp

@@ -3015,7 +3015,7 @@ QgsRectangle QgsLayoutItemMap::computeAtlasRectangle()
   // Note: we cannot directly take the transformation of the bounding box, since transformations are not linear
   QgsGeometry g = mLayout->reportContext().currentGeometry( crs() );
   // Rotating the geometry, so the bounding box is correct wrt map rotation
-  if ( mEvaluatedMapRotation != 0.0 )
+  if ( !g.boundingBox().isEmpty() && mEvaluatedMapRotation != 0.0 )
   {
     QgsPointXY prevCenter = g.boundingBox().center();
     g.rotate( mEvaluatedMapRotation, g.boundingBox().center() );