Missing imports

IPython/nbconvert/transformers/extractfigure.py

@@ -14,7 +14,7 b" notebook file. The extracted figures are returned in the 'resources' dictionary"
 #-----------------------------------------------------------------------------
 
 import sys
-from IPython.utils.traitlets import Dict, Unicode
+from IPython.utils.traitlets import Unicode
 from .base import ConfigurableTransformer
 
 #-----------------------------------------------------------------------------
@@ -27,7 +27,6 b' class ExtractFigureTransformer(ConfigurableTransformer):'
     figures are returned in the 'resources' dictionary.
     """
 
-
     figure_filename_template = Unicode(
         "{unique_key}_{cell_index}_{index}.{extension}", config=True)