Fixed issue with variables being modified when the key isn't valid

Assets/Fungus/Scripts/Commands/LoadVariable.cs

@@ -28,18 +28,19 @@ namespace Fungus
 
         public override void OnEnter()
         {
-            if (key == "" ||
-                variable == null)
+            var flowchart = GetFlowchart();
+
+            // Prepend the current save profile (if any) and make sure all inputs are valid
+            string prefsKey = SetSaveProfile.SaveProfile + "_" + flowchart.SubstituteVariables(key);
+            bool validKey = key != "" && PlayerPrefs.HasKey(prefsKey);
+            bool validVariable = variable != null;
+
+            if (!validKey || !validVariable)
             {
                 Continue();
                 return;
             }
 
-            var flowchart = GetFlowchart();
-
-            // Prepend the current save profile (if any)
-            string prefsKey = SetSaveProfile.SaveProfile + "_" + flowchart.SubstituteVariables(key);
-
             System.Type variableType = variable.GetType();
 
             if (variableType == typeof(BooleanVariable))