Installed unsupported modules breaks Update extensions page

Updated the issue summary.
Exception already handled. But instead of breaking the page, we can show the message to the site builder about the issue.

Created MR for the recommendation. @Sourav_Paul thanks for looking this fix.

While I think this is legitimate bug, I'm not entirely sure this is the correct fix. We probably want to keep throwing the exception, but without breaking the page -- most likely that just means using a try-catch in a strategic spot, rather than removing the exception itself.

Leaving this open because I'd like @tedbow's input here.