Add a testcase for Image raising on bad filename

IPython/core/tests/test_display.py

@@ -457,3 +457,7 def test_display_handle():
         'update': True,
     })
 
+
[e-mail](FileNotFoundError)
+def test_image_bad_filename_raises_proper_exception():
+    display.Image('/this/file/does/not/exist/')