[engine.segment.dumper,viewer] Allow dumped annotations to be viewed

src/mednet/engine/segment/viewer.py

@@ -63,10 +63,11 @@ def view(
         target: numpy.typing.NDArray[numpy.bool_] = numpy.array(f["target"])
         mask: numpy.typing.NDArray[numpy.bool_] = numpy.array(f["mask"])
 
+        pred: numpy.typing.NDArray[numpy.float32] = numpy.empty(
+            (0,), dtype=numpy.float32
+        )
         if "prediction" in f:
-            pred: numpy.typing.NDArray[numpy.float32] = numpy.array(f["prediction"])
-        else:
-            pred = numpy.empty((0,), dtype=numpy.float32)
+            pred = numpy.array(f["prediction"])
 
     image *= mask
     target = numpy.logical_and(target, mask)