Minor changes

Source/Program/DataDef/PowerSupplySharedData.cs

@@ -59,12 +59,13 @@ namespace ProgramLib
 
          lock (syncObjDict[moduleName])
          {
-            if (!_powerSupplyDataDict.ContainsKey(moduleName))
+            PowerSupplyData data = null;
+            if (_powerSupplyDataDict.ContainsKey(moduleName))
             {
-               throw new Exception($"{moduleName} is invalid");
+               data = _powerSupplyDataDict[moduleName];
             }
 
-            return _powerSupplyDataDict[moduleName];
+            return data;
          }
       }