don't insert extra newline for newline tokens.

IPython/utils/PyColorize.py

@@ -218,9 +218,9 b' class Parser:'
         self.pos = newpos + len(toktext)
 
         # handle newlines
-        if toktext and toktype in [token.NEWLINE, tokenize.NL]:
-            owrite(linesep)
-            return
+        #if toktype in [token.NEWLINE, tokenize.NL]:
+        #    owrite(linesep)
+        #    return
 
         # send the original whitespace, if needed
         if newpos > oldpos: