Handle missing noargs (#126)

Did a pip install of this specific branch to ensure the error was gone
when I ran

`cwms-cli`

Author: krowvin

cwmscli/__main__.py

@@ -62,6 +62,10 @@ def main() -> None:
     }
     try:
         cli(standalone_mode=False)
+    except click.exceptions.NoArgsIsHelpError as e:
+        if e.ctx is not None:
+            click.echo(e.ctx.get_help())
+        raise SystemExit(0)
     except SystemExit:
         raise
     except Exception as e: