fix: handle missing current version gracefully in versions command

- Fix crash when running 'solc-select versions' with no version set
- Add try/catch for ArgumentTypeError in versions command
- Strip whitespace from version string when reading from file
- Resolves issue where command would fail instead of listing versions

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: dguido

solc_select/__main__.py

@@ -69,9 +69,13 @@ def solc_select() -> None:
         versions_installed = installed_versions()
         if versions_installed:
             (current_ver, source) = (None, None)
-            res = current_version()
-            if res:
-                (current_ver, source) = res
+            try:
+                res = current_version()
+                if res:
+                    (current_ver, source) = res
+            except argparse.ArgumentTypeError:
+                # No version is currently set, that's ok
+                res = None
             for version in sort_versions(versions_installed):
                 if res and version == current_ver:
                     print(f"{version} (current, set by {source})")

solc_select/solc_select.py

@@ -81,7 +81,7 @@ def current_version() -> (str, str):
         source = source_path.as_posix()
         if Path.is_file(source_path):
             with open(source_path, encoding="utf-8") as f:
-                version = f.read()
+                version = f.read().strip()
         else:
             raise argparse.ArgumentTypeError(
                 "No solc version set. Run `solc-select use VERSION` or set SOLC_VERSION environment variable."