Eqt trace error was thrown if extension uri is not given (#2264)

* eqttrace error was thrown if extension uri is not given

* check for eqttrace error is enable or not

* formatted

src/Microsoft.TestPlatform.Common/ExtensionFramework/Utilities/TestExtensionPluginInformation.cs

@@ -67,7 +67,7 @@ public string ExtensionUri
         private static string GetExtensionUri(Type testLoggerType)
         {
             string extensionUri = string.Empty;
-            
+
             object[] attributes = testLoggerType.GetTypeInfo().GetCustomAttributes(typeof(ExtensionUriAttribute), false).ToArray();
             if (attributes != null && attributes.Length > 0)
             {
@@ -79,6 +79,11 @@ private static string GetExtensionUri(Type testLoggerType)
                 }
             }
 
+            if (EqtTrace.IsErrorEnabled && string.IsNullOrEmpty(extensionUri))
+            {
+                EqtTrace.Error("The type \"{0}\" defined in \"{1}\" does not have ExtensionUri attibute.", testLoggerType.ToString(), testLoggerType.Module.Name);
+            }
+
             return extensionUri;
         }
     }