[MO, Common] Fix SplitConcatPairToInterpolateFusion transformation (#13286)

* [MO, Common] Fix SplitConcatPairToInterpolateFusion transformation

It fixes a case when Split go with disconnected output port.
For this case, this transformation must not be applied.

Signed-off-by: Kazantsev, Roman <roman.kazantsev@intel.com>

* Fix grammar mistake in the comment

* Remove ref_function from the test

Signed-off-by: Kazantsev, Roman <roman.kazantsev@intel.com>

tools/mo/openvino/tools/mo/front/common/partial_infer/utils.py

@@ -329,7 +329,11 @@ def reverse_bypass_infer(node, in_ports: List[int]):
     :param in_ports: input ports for which shape will be updated
     :return:
     """
-    assert node.is_out_port_connected(0)
+    # WA: for cases when terminal Identity node has only output control dependency edges
+    # For this case the graph is not correctly build because the Identity node goes
+    # without Result node
+    if node.out_port(0).disconnected():
+        return
 
     output_shape = node.out_port(0).data.get_shape()
     if output_shape is not None: