404 on past candidates

[patphongs]

What's happening:
Past candidates who ran for a particular office with no financial activity in the current year 2018 are getting 404 errors. Below are all examples of these types of candidates:

Examples:

• Barack Obama Senate candidate: https://fec-dev-proxy.app.cloud.gov/data/candidate/S4IL00180
• John S. Mccain Presidential candidate: https://fec-dev-proxy.app.cloud.gov/data/candidate/P80002801/
• George Bush Presidential candidate
• Martin Frost House candidate: https://fec-dev-proxy.app.cloud.gov/data/candidate/H6TX24057/

Possible related PR:
Refactor candidate view, fix 404's for future candidates
#2320

[lbeaufort]

@patphongs I confirmed these candidate pages now load properly in the staging environment as well.