oeqa/utils/metadata: Add commit_count to fallback logic

Currently if python3-git isn't installed we can get odd behaviours when the
commit_count is absent. Avoid this set of bugs by adding a fallback here.

(From OE-Core rev: b8d22ed681141ce360d742a96cec5f2925a20222)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/utils/metadata.py

@@ -72,8 +72,10 @@ def git_rev_info(path):
             info['commit'] = subprocess.check_output(["git", "rev-parse", "HEAD"], cwd=path).decode('utf-8').strip()
         except subprocess.CalledProcessError:
             pass
-        return info
-
+        try:
+            info['commit_count'] = int(subprocess.check_output(["git", "rev-list", "--count", "HEAD"], cwd=path).decode('utf-8').strip())
+        except subprocess.CalledProcessError:
+            pass
     try:
         repo = Repo(path, search_parent_directories=True)
     except (InvalidGitRepositoryError, NoSuchPathError):