Deal with bad theme config more gracefully. #4220
Merged
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@sturkel89 noticed that, following the removal of the bootstrap3 themes, putting an invalid theme value in config.ini resulted in a blank white screen in browser due to an uncaught exception. Investigating that revealed an orphaned bootprint3 reference in the code. I updated that and added some logic to attempt to display the error page if an exception is thrown during theme initialization. This doesn't result in full valid HTML, but it should be better than a blank white screen for troubleshooting purposes.