Solve LoadImage issue when track_meta is False (#5239)

1. Fix the issue #5227 
2. fix a small code flaw

Signed-off-by: David <dyq.004@gmail.com>

Author: macdavid

monai/data/meta_obj.py

@@ -174,7 +174,8 @@ def meta(self, d) -> None:
         """Set the meta."""
         if d == TraceKeys.NONE:
             self._meta = MetaObj.get_default_meta()
-        self._meta = d
+        else:
+            self._meta = d
 
     @property
     def applied_operations(self) -> list[dict]:

monai/transforms/io/array.py

@@ -278,7 +278,7 @@ def __call__(self, filename: Union[Sequence[PathLike], PathLike], reader: Option
             img = EnsureChannelFirst()(img)
         if self.image_only:
             return img
-        return img, img.meta  # for compatibility purpose
+        return img, img.meta if isinstance(img, MetaTensor) else meta_data
 
 
 class SaveImage(Transform):