fix NRE introduced in 3.17.3 (#3101)

src/Discord.Net.Core/Entities/Interactions/ApplicationCommands/ApplicationCommandOptionChoice.cs

@@ -20,9 +20,13 @@ namespace Discord
         {
             get => _name;
             set
+            {
+                if (value is not null)
                 {
                     Preconditions.AtLeast(value.Length, 1, nameof(Name));
                     Preconditions.AtMost(value.Length, 100, nameof(Name));
+                }
+
                 _name = value;
             }
         }
@@ -38,7 +42,7 @@ namespace Discord
             get => _value;
             set
             {
-                if (value != null && value is not string && !value.IsNumericType())
+                if (value is not null && value is not string && !value.IsNumericType())
                     throw new ArgumentException($"The value of a choice must be a string or a numeric type! Value: \"{value}\"");
                 _value = value;
             }

src/Discord.Net.Core/Entities/Interactions/MessageComponents/Builders/ButtonBuilder.cs

@@ -23,9 +23,13 @@ public class ButtonBuilder
     {
         get => _label;
         set
+        {
+            if (value is not null)
             {
                 Preconditions.AtLeast(value.Length, 1, nameof(Label));
                 Preconditions.AtMost(value.Length, MaxButtonLabelLength, nameof(Label));
+            }
+
             _label = value;
         }
     }
@@ -39,9 +43,13 @@ public class ButtonBuilder
     {
         get => _customId;
         set
+        {
+            if (value is not null)
             {
                 Preconditions.AtLeast(value.Length, 1, nameof(CustomId));
                 Preconditions.AtMost(value.Length, ComponentBuilder.MaxCustomIdLength, nameof(CustomId));
+            }
+
             _customId = value;
         }
     }

src/Discord.Net.Core/Entities/Interactions/MessageComponents/Builders/SelectMenuBuilder.cs

@@ -34,9 +34,13 @@ public class SelectMenuBuilder
     {
         get => _customId;
         set
+        {
+            if (value is not null)
             {
                 Preconditions.AtLeast(value.Length, 1, nameof(CustomId));
                 Preconditions.AtMost(value.Length, ComponentBuilder.MaxCustomIdLength, nameof(CustomId));
+            }
+
             _customId = value;
         }
     }
@@ -62,9 +66,13 @@ public class SelectMenuBuilder
     {
         get => _placeholder;
         set
+        {
+            if (value is not null)
             {
                 Preconditions.AtLeast(value.Length, 1, nameof(Placeholder));
                 Preconditions.AtMost(value.Length, MaxPlaceholderLength, nameof(Placeholder));
+            }
+
             _placeholder = value;
         }
     }

src/Discord.Net.Core/Entities/Interactions/MessageComponents/Builders/SelectMenuOptionBuilder.cs

@@ -31,9 +31,13 @@ public class SelectMenuOptionBuilder
     {
         get => _label;
         set
+        {
+            if (value is not null)
             {
                 Preconditions.AtLeast(value.Length, 1, nameof(Label));
                 Preconditions.AtMost(value.Length, MaxSelectLabelLength, nameof(Label));
+            }
+
             _label = value;
         }
     }
@@ -47,9 +51,13 @@ public class SelectMenuOptionBuilder
     {
         get => _value;
         set
+        {
+            if (value is not null)
             {
                 Preconditions.AtLeast(value.Length, 1, nameof(Value));
                 Preconditions.AtMost(value.Length, MaxSelectValueLength, nameof(Value));
+            }
+
             _value = value;
         }
     }
@@ -63,9 +71,13 @@ public class SelectMenuOptionBuilder
     {
         get => _description;
         set
+        {
+            if (value is not null)
             {
                 Preconditions.AtLeast(value.Length, 1, nameof(Description));
                 Preconditions.AtMost(value.Length, MaxDescriptionLength, nameof(Description));
+            }   
+
             _description = value;
         }
     }

src/Discord.Net.Core/Entities/Interactions/MessageComponents/Builders/TextInputBuilder.cs

@@ -23,9 +23,13 @@ public class TextInputBuilder
     {
         get => _customId;
         set
+        {
+            if (value is not null)
             {
                 Preconditions.AtLeast(value.Length, 1, nameof(CustomId));
                 Preconditions.AtMost(value.Length, ComponentBuilder.MaxCustomIdLength, nameof(CustomId));
+            }
+
             _customId = value;
         }
     }

src/Discord.Net.Core/Entities/Interactions/Modals/ModalBuilder.cs

@@ -39,9 +39,13 @@ namespace Discord
         {
             get => _customId;
             set
+            {
+                if (value is not null)
                 {
                     Preconditions.AtLeast(value.Length, 1, nameof(CustomId));
                     Preconditions.AtMost(value.Length, ComponentBuilder.MaxCustomIdLength, nameof(CustomId));
+                }
+
                 _customId = value;
             }
         }