Update git_describe() (#7402)

* Update `git_describe()`

Add .git path check to avoid `fatal: not a git repository (or any of the parent directories): .git` printout

* Update general.py

utils/general.py

@@ -275,6 +275,7 @@ def check_online():
 def git_describe(path=ROOT):  # path must be a directory
     # Return human-readable git description, i.e. v5.0-5-g3e25f1e https://git-scm.com/docs/git-describe
     try:
+        assert (Path(path) / '.git').is_dir()
         return check_output(f'git -C {path} describe --tags --long --always', shell=True).decode()[:-1]
     except Exception:
         return ''