ImageCache Defaults detects file paths in broken images (404 errors) generated by ImageCache (D6) and Image (D7). ImageCache Defaults can either remove images with broken paths from your markup completely or replace them with a configurable default image.
It is very important when updating this module that you update Google Charts as well, at least during this stage in development. This module is still in its infancy, so features are being added frequently. Some dashboard configurations may not be stable enough for production sites, but enhancements and bug fixes will continue to be committed frequently. It is important that users get involved in promoting the stability of Views Chart Tools by taking the time to contribute with bug reports and feature requests.
Tutorials
We are currently developing tutorials on the various intermediate and advanced features of Views Chart Tools. Check back frequently for new documentation and tutorials.