fill-paragraph in a comment does not stop at "empty comment lines"

[Yaroslav Halchenko]

in older version of python-mode (5.1.0) fill-paragraph (Alt-q) e.g. on first line of

# line1: alskdjfl aksdjlfkas dklfj aslkdjf aklsdj flkasjd fklasjd lfkasj dlkfj asdklfj aslkdfj
#
# line2

would fill only portion of line1:

# line1: alskdjfl aksdjlfkas dklfj aslkdjf aklsdj flkasjd fklasjd
# lfkasj dlkfj asdklfj aslkdfj
#
# line2

while current version disregards such stop paragraph separation... unless it is at the beginning of the buffer!! ;), so adding an empty line before the first comment line of this test example, results in:

# line1: alskdjfl aksdjlfkas dklfj aslkdjf aklsdj flkasjd fklasjd
# lfkasj dlkfj asdklfj aslkdfj line2