Added a configuration setting for mapproxy so that if an error occurs it just skips the tile.
Added a configuration setting for mapproxy so that if an error occurs it just skips the tile.

venicegeo/eventkit-cloud,terranodo/eventkit-cloud,terranodo/eventkit-cloud,terranodo/eventkit-cloud,venicegeo/eventkit-cloud,venicegeo/eventkit-cloud,venicegeo/eventkit-cloud,venicegeo/eventkit-cloud,terranodo/eventkit-cloud,venicegeo/eventkit-cloud