Fix errors when using the --help option (#1910)

poetry/console/config/application_config.py

@@ -9,6 +9,7 @@ from clikit.api.event import PRE_HANDLE
 from clikit.api.event import PreHandleEvent
 from clikit.api.event import PreHandleEvent
 from clikit.api.event import PreResolveEvent
 from clikit.api.event import PreResolveEvent
 from clikit.api.event.event_dispatcher import EventDispatcher
 from clikit.api.event.event_dispatcher import EventDispatcher
+from clikit.api.exceptions import CliKitException
 from clikit.api.formatter import Style
 from clikit.api.formatter import Style
 from clikit.api.io import Input
 from clikit.api.io import Input
 from clikit.api.io import InputStream
 from clikit.api.io import InputStream
@@ -101,7 +102,16 @@ class ApplicationConfig(BaseApplicationConfig):
         if args.has_option_token("-h") or args.has_option_token("--help"):
         if args.has_option_token("-h") or args.has_option_token("--help"):
             from clikit.api.resolver import ResolvedCommand
             from clikit.api.resolver import ResolvedCommand
 
 
-            resolved_command = self.command_resolver.resolve(args, application)
+            try:
+                resolved_command = self.command_resolver.resolve(args, application)
+            except CliKitException:
+                # We weren't able to resolve the command,
+                # due to a parse error most likely,
+                # so we fall back on the default behavior
+                return super(ApplicationConfig, self).resolve_help_command(
+                    event, event_name, dispatcher
+                )
+
             # If the current command is the run one, skip option
             # If the current command is the run one, skip option
             # check and interpret them as part of the executed command
             # check and interpret them as part of the executed command
             if resolved_command.command.name == "run":
             if resolved_command.command.name == "run":