Add version placeholder for cases when kataloger package can't be found

pyproject.toml

@@ -45,7 +45,8 @@ kataloger = "kataloger.__main__:main"
 "Changelog" = "https://github.com/dzmpr/kataloger/releases"
 
 [tool.pytest.ini_options]
-pythonpath = "src/"
+pythonpath = "src"
+testpaths = "tests"
 
 [tool.ruff]
 line-length = 120

src/kataloger/cli/argument_parser.py

@@ -1,5 +1,5 @@
 from argparse import ArgumentParser
-from importlib.metadata import version
+from importlib.metadata import PackageNotFoundError, version
 from pathlib import Path
 from typing import List, Optional
 
@@ -76,7 +76,11 @@ def parse_arguments(*args: str) -> KatalogerArguments:
 def _get_kataloger_version() -> str:
     if __name__ == "__main__":
         return "indev"
-    return version(package_name)
+
+    try:
+        return version(package_name)
+    except PackageNotFoundError:
+        return "unknown"
 
 
 def _get_catalogs(path_strings: List[str]) -> Optional[List[Catalog]]: