Drop unused traitlet imports

IPython/nbconvert/exporters/html.py

@@ -12,8 +12,6 b''
 # Imports
 #-----------------------------------------------------------------------------
 
-from IPython.utils.traitlets import Unicode, List
-
 from IPython.nbconvert import preprocessors
 from IPython.config import Config
 

IPython/nbconvert/exporters/latex.py

@@ -16,7 +16,7 b''
 import os
 
 # IPython imports
-from IPython.utils.traitlets import Unicode, List
+from IPython.utils.traitlets import Unicode
 from IPython.config import Config
 
 from IPython.nbconvert import filters, preprocessors

IPython/nbconvert/exporters/markdown.py

@@ -13,7 +13,6 b''
 #-----------------------------------------------------------------------------
 
 from IPython.config import Config
-from IPython.utils.traitlets import Unicode
 
 from .templateexporter import TemplateExporter
 

IPython/nbconvert/exporters/python.py

@@ -12,8 +12,6 b''
 # Imports
 #-----------------------------------------------------------------------------
 
-from IPython.utils.traitlets import Unicode
-
 from .templateexporter import TemplateExporter
 
 #-----------------------------------------------------------------------------

IPython/nbconvert/exporters/rst.py

@@ -12,7 +12,6 b''
 # Imports
 #-----------------------------------------------------------------------------
 
-from IPython.utils.traitlets import Unicode
 from IPython.config import Config
 
 from .templateexporter import TemplateExporter

IPython/nbconvert/exporters/slides.py

@@ -12,8 +12,6 b''
 # Imports
 #-----------------------------------------------------------------------------
 
-from IPython.utils.traitlets import Unicode
-
 from IPython.nbconvert import preprocessors
 from IPython.config import Config