Avoid version checking when version info is absent

Fixes: ansible#2713
Related: pre-commit/pre-commit#2610

src/ansiblelint/config.py

@@ -260,15 +260,15 @@ def get_version_warning() -> str:
 
     html_url = data["html_url"]
     new_version = Version(data["tag_name"][1:])  # removing v prefix from tag
-    # breakpoint()
 
-    if current_version > new_version:
-        msg = "[dim]You are using a pre-release version of ansible-lint.[/]"
-    elif current_version < new_version:
-        msg = f"""[warning]A new release of ansible-lint is available: [red]{current_version}[/] → [green][link={html_url}]{new_version}[/][/][/]"""
+    if current_version != "0.1.dev1":
+        if current_version > new_version:
+            msg = "[dim]You are using a pre-release version of ansible-lint.[/]"
+        elif current_version < new_version:
+            msg = f"""[warning]A new release of ansible-lint is available: [red]{current_version}[/] → [green][link={html_url}]{new_version}[/][/][/]"""
 
-        pip = guess_install_method()
-        if pip:
-            msg += f" Upgrade by running: [info]{pip}[/]"
+            pip = guess_install_method()
+            if pip:
+                msg += f" Upgrade by running: [info]{pip}[/]"
 
     return msg

src/ansiblelint/version.py

@@ -8,6 +8,8 @@
 
         __version__ = pkg_resources.get_distribution("ansible-lint").version
     except Exception:  # pylint: disable=broad-except
-        __version__ = "unknown"
+        # this is the fallback SemVer version picked by setuptools_scm when tag
+        # information is not available.
+        __version__ = "0.1.dev1"
 
 __all__ = ("__version__",)