bitbake: bitbake: fix version comparison when one of the versions ends in .

Previously, this would happen:

======================================================================
ERROR: test_vercmpstring (bb.tests.utils.VerCmpString)
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Traceback (most recent call last):
  File "/home/alexander/development/poky/bitbake/lib/bb/tests/utils.py", line 45, in test_vercmpstring
    result = bb.utils.vercmp_string('1.', '1.1')
  File "/home/alexander/development/poky/bitbake/lib/bb/utils.py", line 143, in vercmp_string
    return vercmp(ta, tb)
  File "/home/alexander/development/poky/bitbake/lib/bb/utils.py", line 135, in vercmp
    r = vercmp_part(va, vb)
  File "/home/alexander/development/poky/bitbake/lib/bb/utils.py", line 124, in vercmp_part
    elif ca < cb:
TypeError: '<' not supported between instances of 'NoneType' and 'int'

----------------------------------------------------------------------

(Bitbake rev: fef56d28c3efec4876c379898cbc4d4c65303aee)

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/bitbake/lib/bb/utils.py b/bitbake/lib/bb/utils.py
index 9cb702dbb7..b652a6838a 100644
--- a/bitbake/lib/bb/utils.py
+++ b/bitbake/lib/bb/utils.py
@@ -121,6 +121,10 @@ def vercmp_part(a, b):
             return -1
         elif oa > ob:
             return 1
+        elif ca is None:
+            return -1
+        elif cb is None:
+            return 1
         elif ca < cb:
             return -1
         elif ca > cb: