Slightly more useful error message for missing limits for hs ancillaries

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>

src/Backends/Helmholtz/Fluids/Ancillaries.cpp

@@ -24,7 +24,6 @@ SaturationAncillaryFunction::SaturationAncillaryFunction(rapidjson::Value &json_
             Tmax = cpjson::get_double(json_code,"Tmax");
         }
         catch (std::exception &e){
-            std::cout << "Missing Tmin, Tmax" << std::endl;
             Tmin = _HUGE;
             Tmax = _HUGE;
         }

src/Backends/Helmholtz/Fluids/FluidLibrary.h

@@ -1022,6 +1022,9 @@ protected:
         else{
             if (get_debug_level() > 0){ std::cout << "Missing sLV ancillary for fluid " << fluid.name; }
         }
+        if (!ValidNumber(fluid.ancillaries.sL.get_Tmin())){
+            std::cout << "Tmin invalid for sL for " << fluid.name << std::endl;
+        }
         
     };