fix: catch FileNotFoundError in get_current_branch when component dir is missing (#813)

Error when opening KIUAH fix

get_current_branch only catches CalledProcessError, not FileNotFoundError. When crowsnest isn't installed, the missing dir propagates the exception. Fix

kiauh/utils/git_utils.py

@@ -109,7 +109,7 @@ def get_current_branch(repo: Path) -> str | None:
         )
         return result.strip() if result else None
 
-    except CalledProcessError:
+    except (CalledProcessError, FileNotFoundError):
         return None