On course about page, display course end date if no about page HTML blog (end_date.html) exists.

#224

common/test/data/test_about_blob_end_date/README.md

@@ -2,4 +2,4 @@ Test course for checking the end date displayed on the course about page.
 This course has both an end_date HTML "blob", and it also has a course end date set.
 The end_date "blob" has higher precedence and will show.
 
-See also test_end course.
+See also test_end course.
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common/test/data/test_about_blob_end_date/about/end_date.html

-Learning never ends
+Learning never ends
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common/test/data/test_about_blob_end_date/course.xml

-<course org="edX" course="test_about_blob_end_date" url_name="2012_Fall"/>
+<course org="edX" course="test_about_blob_end_date" url_name="2012_Fall"/>
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common/test/data/test_end/README.md

@@ -2,4 +2,4 @@ Test course for checking the end date displayed on the course about page.
 This course does not have an end_date HTML "blob", but it does have a course end date set.
 Therefore the course end date should show on the course about page.
 
-See also test_about_blob_end_date course.
+See also test_about_blob_end_date course.
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common/test/data/test_end/course.xml

-<course org="edX" course="test_end" url_name="2012_Fall"/>
+<course org="edX" course="test_end" url_name="2012_Fall"/>
\ No newline at end of file