MAKE IT MORE RESILIENT TO ERRORS

[Highfire1]

it tends to crash whenever we see data that is not exactly as expected (usually a null property where we have hardcoded an expectation of seeing a value there).

This should not crash the entire program.

also /execs and /executives should save a last_modified and last_checked property so that we can sanity check responses

[Highfire1]

also the notion api goes down sometimes