Fix click element in WebDriver.

src/Plugins/BotSharp.Plugin.WebDriver/Drivers/PlaywrightDriver/PlaywrightWebDriver.ClickElement.cs

@@ -14,7 +14,7 @@ public partial class PlaywrightWebDriver
         foreach (var a in anchors)
         {
             var text = await a.TextContentAsync();
-            str.Add($"<a>{text}</a>");
+            str.Add($"<a>{(string.IsNullOrEmpty(text) ? "EMPTY" : text)}</a>");
         }
 
         var buttons = await body.QuerySelectorAllAsync("button");

src/Plugins/BotSharp.Plugin.WebDriver/agents/f3ae2a0f-e6ba-4ee1-a0b9-75d7431ff32b/functions.json

@@ -10,7 +10,7 @@
                   "description": "website url."
                 }
             },
-            "required": []
+            "required": ["url"]
         }
     },
     {
@@ -42,7 +42,7 @@
                     "description": "user input."
                   }
             },
-            "required": ["element_name"]
+            "required": ["element_name", "input_text"]
         }
     }
 ]