bot: check if plugins have their dependencies met

edmond/bot.py

@@ -73,6 +73,10 @@ class Bot(irc.client.SimpleIRCClient, Logger):
         )
         for plugin_name in plugin_names:
             module = importlib.import_module(f"edmond.plugins.{plugin_name}")
+            are_dependencies_ok = getattr(module, "DEPENDENCIES_FOUND", True)
+            if not are_dependencies_ok:
+                self.log_e(f"Dependencies not found for plugin {plugin_name}.")
+                continue
             class_name = plugin_name.capitalize() + "Plugin"
             plugin_class = getattr(module, class_name)
             self.plugins.append(plugin_class(self))