scripts/oe-git-archive: fix non-existent key referencing error
Without installing gitpython package, oe-git-archive will face error
below, where it was referencing key that was non-existent inside
metadata object.
Traceback (most recent call last):
File "<poky_dir>/scripts/oe-git-archive", line 271, in <module>
sys.exit(main())
File "<poky_dir>/scripts/oe-git-archive", line 229, in main
'commit_count': metadata['layers']['meta']['commit_count'],
KeyError: 'commit_count'
Fix this error by adding exception catch when referencing
non-existent key (based on inputs provided by Richard Purdie).
[YOCTO# 13082]
Signed-off-by: Yeoh Ee Peng <ee.peng.yeoh@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
