Fix JsonUtils.GetFailurePath for root arrays and empty values

Author: exyi

src/Framework/Framework/Utils/SystemTextJsonUtils.cs

@@ -18,8 +18,8 @@ public static string[] GetFailurePath(ReadOnlySpan<byte> data)
             // the "max depth exceeded" error
             var options = new JsonReaderOptions { MaxDepth = 196 };
             var reader = new Utf8JsonReader(data, false, new JsonReaderState(options));
-            reader.AssertRead();
-            if (reader.TokenType != JsonTokenType.StartObject) throw new Exception("wtf");
+            if (!reader.Read())
+                return [];
             return GetFailurePathInternal(ref reader) ?? throw new Exception("No error in specified JSON");
         }
 

src/Tests/ViewModel/JsonUtilsTests.cs

@@ -84,12 +84,22 @@ public class JsonUtilsTests
             "items/0"
         )]
         [DataRow(
-            $$"""
+            """
             { "arr": [[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[1, 2], []]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]],
                 "prop": 1
             """,
             "prop"
         )]
+        [DataRow(
+            """
+            [
+                1, 2,
+                { "ok": true },
+                { "not_ok":
+            """,
+            "3/not_ok"
+        )]
+        [DataRow("   ", "")]
         public void GetInvalidJsonErrorPath(string json, string expectedPath)
         {
             var utf8 = StringUtils.Utf8.GetBytes(json);