Fix help (pinfo2) view highlighting

IPython/core/interactiveshell.py

@@ -624,7 +624,7 b' class InteractiveShell(SingletonConfigurable):'
         # Object inspector
         self.inspector = oinspect.Inspector(oinspect.InspectColors,
                                             PyColorize.ANSICodeColors,
-                                            'NoColor',
+                                            self.colors,
                                             self.object_info_string_level)
 
     def init_io(self):

IPython/core/oinspect.py

@@ -352,7 +352,7 b' class Inspector(Colorable):'
 
     def __init__(self, color_table=InspectColors,
                  code_color_table=PyColorize.ANSICodeColors,
-                 scheme='NoColor',
+                 scheme=None,
                  str_detail_level=0,
                  parent=None, config=None):
         super(Inspector, self).__init__(parent=parent, config=config)
@@ -379,6 +379,7 b' class Inspector(Colorable):'
                            self.color_table.active_colors.normal)
 
     def set_active_scheme(self, scheme):
+        if scheme is not None:
         self.color_table.set_active_scheme(scheme)
         self.parser.color_table.set_active_scheme(scheme)