data should be an object error if slic-watch config is missing

[eoinsha]

Describe the bug
When the plugin is installed and added to plugins but no configuration is present, the following error occurs.

 Serverless Error ----------------------------------------

  SLIC Watch configuration is invalid: data should be object

This is not really clear

To Reproduce
Steps to reproduce the behavior:

1. npm install serverless-slic-watch-plugin
2. Add serverless-slic-watch-plugin to plugins section

Expected behavior
The process should proceed with a default configuration for SLIC Watch or a clear error should convey that the configuration is missing.

Screenshots, Input Files and Logs