Fix bugs

Author: inputfalken

src/DynamoDBGenerator/Internal/MarshallHelper.cs

@@ -53,7 +53,12 @@ public static AttributeValue FromNullableNumberSet<T>(IEnumerable<T?> numbers, s
         where T : struct, INumber<T>
     {
         if (numbers.TryGetNonEnumeratedCount(out var count) is false)
-            return new AttributeValue { NS = numbers.Select(x => x.ToString()).ToList() };
+            return new AttributeValue
+            {
+                NS = numbers
+                    .Select(x => x.ToString())
+                    .Where(x => string.IsNullOrEmpty(x) is false).ToList()
+            };
 
         if (count is 0)
             return new AttributeValue { NS = [] };
@@ -68,15 +73,34 @@ public static AttributeValue FromNumberSet<T>(IEnumerable<T> numbers, string? da
         where T : struct, INumber<T>
     {
         if (numbers.TryGetNonEnumeratedCount(out var count) is false)
-            return new AttributeValue { NS = numbers.Select(x => x.ToString()).ToList() };
+        {
+            var noCapacity = new List<string>();
+
+            foreach (var number in numbers)
+            {
+                var @string = number.ToString();
+                if (string.IsNullOrEmpty(@string))
+                    throw ExceptionHelper.NotNull($"{dataMember}[UNKNOWN]");
+
+                noCapacity.Add(@string);
+            }
+
+            return new AttributeValue { NS = noCapacity };
+        }
 
         if (count is 0)
             return new AttributeValue { NS = [] };
 
         var list = new List<string>(count);
 
-        foreach (var @string in numbers)
-            list.Add(@string.ToString() ?? throw ExceptionHelper.NotNull($"{dataMember}[UNKNOWN]"));
+        foreach (var number in numbers)
+        {
+            var @string = number.ToString();
+            if (string.IsNullOrEmpty(@string))
+                throw ExceptionHelper.NotNull($"{dataMember}[UNKNOWN]");
+
+            list.Add(@string);
+        }
 
         return new AttributeValue { NS = list };
     }