Allow not having a typer.Typer app instance

- Remove "app" from plugins/bill-teams/cli.py for when the necessary dependencies aren't found
- Yield "None" for when no "app" is found in cli.py
- Only add "app" that is not None to main app in src/elapi/cli/elapi.py

Author: mhxion

src/elapi/cli/_plugin_handler.py

@@ -38,7 +38,10 @@ def get_typer_apps(self) -> Generator[typer.Typer, None, None]:
             )  # Python will find module relative to __package__ path,
             # without this module.__package__ change Python will throw an ImportError.
             spec.loader.exec_module(module)
-            yield getattr(module, INTERNAL_PLUGIN_TYPER_APP_VAR_NAME)
+            try:
+                yield getattr(module, INTERNAL_PLUGIN_TYPER_APP_VAR_NAME)
+            except AttributeError:
+                yield
 
 
 internal_plugin_typer_apps = InternalPluginHandler().get_typer_apps()

src/elapi/cli/elapi.py

@@ -174,12 +174,13 @@ def cli_startup_for_plugins(
 
 
 for _app in internal_plugin_typer_apps:
-    COMMANDS_TO_SKIP_CLI_STARTUP.append(_app.info.name)
-    app.add_typer(
-        _app,
-        rich_help_panel="Plugins",
-        callback=cli_startup_for_plugins,
-    )
+    if _app is not None:
+        COMMANDS_TO_SKIP_CLI_STARTUP.append(_app.info.name)
+        app.add_typer(
+            _app,
+            rich_help_panel="Plugins",
+            callback=cli_startup_for_plugins,
+        )
 
 typer.rich_utils.STYLE_HELPTEXT = (
     ""  # fixes https://github.com/tiangolo/typer/issues/437

src/elapi/plugins/bill_teams/cli.py

@@ -5,7 +5,7 @@
 PLUGIN_NAME: str = "bill-teams"
 
 if not (find_spec("tenacity") and find_spec("dateutil")):
-    app = typer.Typer()
+    ...
 else:
     from typing import Annotated, Optional