add missing find method

Pilz/Data/DataManager.cs

@@ -97,13 +97,24 @@ public abstract class DataManager : IDataManager
 
     public virtual bool Find<T>(int id, [NotNullWhen(true)] out T? obj) where T : class, IDataObject
     {
-        if (FindEntity<T>(id) is not T t)
+        if (Find<T>(id) is T t)
         {
-            obj = default;
+            obj = t;
-            return false;
+            return true;
         }
-        obj = t;
+        obj = default;
-        return true;
+        return false;
+    }
+
+    public virtual bool Find<T>(int? id, [NotNullWhen(true)] out T? obj) where T : class, IDataObject
+    {
+        if (Find<T>(id) is T t)
+        {
+            obj = t;
+            return true;
+        }
+        obj = default;
+        return false;
     }
 
     public virtual void Delete<T>(int id) where T : class, IDataObject

Pilz/Data/IDataManager.cs

@@ -11,6 +11,7 @@ public interface IDataManager
     T? Find<T>(int id) where T : class, IDataObject;
     bool Find<T>(int id, [NotNullWhen(true)] out T? obj) where T : class, IDataObject;
     T? Find<T>(int? id) where T : class, IDataObject;
+    bool Find<T>(int? id, [NotNullWhen(true)] out T? obj) where T : class, IDataObject;
     T FindOrNew<T>(int id) where T : class, IDataObject;
     bool FindOrNew<T>(int id, [NotNullWhen(true)] out T? obj) where T : class, IDataObject;
     T FindOrNew<T>(int? id) where T : class, IDataObject;