Update version to 2.0.2 and modify CLI argument handling

- Bumped the project version to 2.0.2 in pyproject.toml.
- Changed the subparsers requirement in the CLI to allow for no command, and added a help message for users when no arguments are provided.

Author: JoshuaHarris391

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "Gen3SchemaDev"
-version = "2.0.1"
+version = "2.0.2"
 description = "Tool for data modelling in Gen3"
 authors = [
     {name = "JoshuaHarris391",email = "[email protected]"}

src/gen3schemadev/cli.py

@@ -47,8 +47,12 @@ def main():
         action="store_true",
         help="Show version and exit"
     )
-    # Subparsers are now required, ensuring a command is always run
-    subparsers = parser.add_subparsers(dest="command", required=True)
+    subparsers = parser.add_subparsers(dest="command", required=False)
+
+    # Print help and exit if no arguments are provided
+    if len(sys.argv) == 1:
+        parser.print_help(sys.stderr)
+        sys.exit(0)
 
     # Create 'generate' subcommand
     generate_parser = subparsers.add_parser(