Merge pull request #8402 from OPM/8401-flow-vector-result

#8401 Flow Vector Result: Handle empty results for first time step
Use OpenMP for vector calculations

Janitor: Use field of double instead of float to avoid rounding errors. If float is used in field, the current editor is has rounding effects that makes the text representation of 0.1 turn into 0.09999999....

ApplicationLibCode/ReservoirDataModel/RigResultModifierFactory.cpp

@@ -65,6 +65,8 @@ cvf::ref<RigResultModifier> RigResultModifierFactory::createResultModifier( RigE
         resultValues = &( scalarSetResults->at( timeStepIndex ) );
     }
 
+    if ( resultValues->empty() ) return nullptr;
+
     bool useGlobalActiveIndex = eclipseCase->results( porosityModel )->isUsingGlobalActiveIndex( resVarAddr );
     if ( useGlobalActiveIndex )
     {