No errors are shown when --plugin-script plugin fails to import

[ivan]

The plugin loader should print errors for plugins that fail to import.

No errors are shown even with wpull --debug.

[ivan]

https://github.com/tibonihoo/yapsy/blob/434e20f5a19cb14dd2db5aaa333b120803b39e8a/package/yapsy/PluginManager.py#L506-L513

<@JAA>  ivan: Could be this: https://github.com/tibonihoo/yapsy/blob/434e20f5a19cb14dd2db5aaa333b120803b39e8a/package/yapsy/PluginManager.py#L506-L513
<@JAA>  IIRC, the log output from wpull suppresses all messages which don't come from wpull.* loggers.
<@JAA>  Yeah, logging.Filter in wpull.application.tasks.log.LoggingSetupTask._setup_console_logger.
<@JAA>  Although it seems like the file handler doesn't use that filter, so the log file created with --output should contain those lines.