fix plugin run without option field

PluginOptions/Options.cs

@@ -11,6 +11,12 @@ public class Options
     public Options(GenerateRequest generateRequest)
     {
         var text = Encoding.UTF8.GetString(generateRequest.PluginOptions.ToByteArray());
+        // handle empty options case
+        if (text.Trim() == string.Empty)
+        {
+            text = "{}";
+        }
+
         var rawOptions = JsonSerializer.Deserialize<RawOptions>(text) ?? throw new InvalidOperationException();
 
         DriverName = EngineToDriverMapping[generateRequest.Settings.Engine];

examples/QuickStartMySqlDalGen/Models.cs

@@ -0,0 +1,64 @@
+// auto-generated by sqlc - do not edit
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace QuickStartMySqlDalGen;
+public readonly record struct Author(long Id, string Name, string? Bio);
+public readonly record struct Book(long Id, string Name, long AuthorId, string? Description);
+public readonly record struct ExtendedBio(string? AuthorName, string? Name, BiosBioType? BioType, HashSet<BiosAuthorType>? AuthorType);
+public enum BiosBioType
+{
+    Invalid = 0, // reserved for invalid enum value
+    Autobiography = 1,
+    Biography = 2,
+    Memoir = 3
+}
+
+public static class BiosBioTypeExtensions
+{
+    private static readonly Dictionary<string, BiosBioType> StringToEnum = new Dictionary<string, BiosBioType>()
+    {
+        [string.Empty] = BiosBioType.Invalid,
+        ["Autobiography"] = BiosBioType.Autobiography,
+        ["Biography"] = BiosBioType.Biography,
+        ["Memoir"] = BiosBioType.Memoir
+    };
+    public static BiosBioType ToBiosBioType(this string me)
+    {
+        return StringToEnum[me];
+    }
+
+    public static HashSet<BiosBioType> ToBiosBioTypeSet(this string me)
+    {
+        return new HashSet<BiosBioType>(me.Split(',').ToList().Select(v => StringToEnum[v]));
+    }
+}
+
+public enum BiosAuthorType
+{
+    Invalid = 0, // reserved for invalid enum value
+    Author = 1,
+    Editor = 2,
+    Translator = 3
+}
+
+public static class BiosAuthorTypeExtensions
+{
+    private static readonly Dictionary<string, BiosAuthorType> StringToEnum = new Dictionary<string, BiosAuthorType>()
+    {
+        [string.Empty] = BiosAuthorType.Invalid,
+        ["Author"] = BiosAuthorType.Author,
+        ["Editor"] = BiosAuthorType.Editor,
+        ["Translator"] = BiosAuthorType.Translator
+    };
+    public static BiosAuthorType ToBiosAuthorType(this string me)
+    {
+        return StringToEnum[me];
+    }
+
+    public static HashSet<BiosAuthorType> ToBiosAuthorTypeSet(this string me)
+    {
+        return new HashSet<BiosAuthorType>(me.Split(',').ToList().Select(v => StringToEnum[v]));
+    }
+}