Do not report errors to Sentry in Django shells

Closes #759 (closed)

There is no easy way to tell Sentry to ignore exceptions whose stack trace contains django.core.management.commands.shell or something that comes from its REPL. I had made multiple tests earlier with before_send hooks and analyzing the traceback, but it's a mess. The only way I found to not enable Sentry on Django shells is to look for shell or shell_plus in the command line, and just not initialize Sentry at all when it's there.

assigned to @erwanrouchet

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requested review from @babadie

added 3 commits

• 6a533475...0495d4cb - 2 commits from branch master
• ea8d6bf6 - Do not report errors to Sentry in Django shells

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merged

mentioned in commit a2f81217