Fix internal Rollbar error caused when ActiveRecord was present, but not used #204
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If the ActiveRecord gem was required in a Rails app, but not actually used or configured (in favor of some other ORM or no ORM), then Rollbar would internally error whenever it tried to send an exception message. This was being caused by the person tracking functionality seeing that ActiveRecord existed, but then it would raise a ActiveRecord::ConnectionNotEstablished error when it actually tried to use the connection. This in turn led to a rather non-obvious error in the logs:
This should fix this person-tracking situation by first checking whether ActiveRecord is actually connected before trying to do ActiveRecord-specific functions.