Add PR number and blank line

Author: Guilherme Beltramini

doc/source/whatsnew/v0.21.0.txt

@@ -115,7 +115,7 @@ Other Enhancements
 - :func:`DataFrame.items` and :func:`Series.items` is now present in both Python 2 and 3 and is lazy in all cases (:issue:`13918`, :issue:`17213`)
 - :func:`Styler.where` has been implemented. It is as a convenience for :func:`Styler.applymap` and enables simple DataFrame styling on the Jupyter notebook (:issue:`17474`).
 - :func:`MultiIndex.is_monotonic_decreasing` has been implemented.  Previously returned ``False`` in all cases. (:issue:`16554`)
-- :func:`read_excel` raises ``ImportError`` with better message if ``xlrd`` is not installed
+- :func:`read_excel` raises ``ImportError`` with better message if ``xlrd`` is not installed. (:issue:`17613`)
 
 
 .. _whatsnew_0210.api_breaking:

pandas/io/excel.py

@@ -240,6 +240,7 @@ class ExcelFile(object):
     def __init__(self, io, **kwds):
 
         err_msg = "Install xlrd >= 0.9.0 for Excel support"
+
         try:
             import xlrd
         except ImportError: