fix for fodder_maize

Models/GamsParameter.cs

@@ -34,6 +34,25 @@ namespace FarmMapsAPI.Carbon.Models
             }
         }
 
+        public void AddOrUpdateValue((string, int, string) key, string column, double value)
+        {
+            if (TrippleKeyParam.ContainsKey(key))
+            {
+                if (TrippleKeyParam[key].Any(x => x.Key == column))
+                {
+                    TrippleKeyParam[key].Single(x => x.Key == column).Value = value;
+                }
+                else
+                {
+                    TrippleKeyParam[key].Add(new ColumnValue(column, value));
+                }
+            }
+            else
+            {
+                TrippleKeyParam.Add(key, new List<ColumnValue> { new ColumnValue(column, value) });
+            }
+        }
+
         public void AddValueSkipIfColumnExists((string, int, string) key, string column, double value)
         {
             if (TrippleKeyParam.ContainsKey(key))