Removed trailing empty lines from comment message.

rtv/submission.py

@@ -139,9 +139,10 @@ class SubmissionPage(BasePage):
             fp.seek(0)
             comment_text = '\n'.join(line for line in fp.read().split('\n')
                                      if not line.startswith("#"))
+            comment_text = comment_text.rstrip()
         curses.doupdate()
 
-        if comment_text is None or comment_text.isspace():
+        if not comment_text:
             curses.flash()
             return