Regression test fixes (#9068)

* Make sure font size is updated correctly
* Hide empty sub titles
* Do not categorize as water cut if no curves are visible
* Propagate settings from single summary plot to summary multi plot

ApplicationLibCode/ProjectDataModel/Summary/RimSummaryPlot.cpp

@@ -938,8 +938,10 @@ void RimSummaryPlot::updateZoomForAxis( RiuPlotAxis plotAxis )
 //--------------------------------------------------------------------------------------------------
 bool RimSummaryPlot::isOnlyWaterCutCurvesVisible( RiuPlotAxis plotAxis )
 {
+    auto curves = visibleSummaryCurvesForAxis( plotAxis );
+    if ( curves.empty() ) return false;
+
     size_t waterCutCurveCount = 0;
-    auto   curves             = visibleSummaryCurvesForAxis( plotAxis );
     for ( auto c : curves )
     {
         auto quantityName = c->summaryAddressY().vectorName();