fix strikethrough issues on `No new line at end of file`

rhodecode/lib/diffs.py

@@ -401,7 +401,7 b' class DiffProcessor(object):'
                 try:
                     while 1:
                         line = lineiter.next()
-                        if line['action'] != 'unmod':
+                        if line['action'] not in ['unmod', 'context']:
                             nextline = lineiter.next()
                             if nextline['action'] in ['unmod', 'context'] or \
                                nextline['action'] == line['action']: