Smarter recovery when the cache is corrupt

[AllenEllis]

I don't know why but some cities have a poisioned cache. Examples:

• https://everysinglemonth.org/index.php?action=process&city_name=Bonanza%2C+UT&city=16000US4906920
• https://everysinglemonth.org/index.php?action=process&city_name=Monowi%2C+NE&city=16000US3132550
• https://everysinglemonth.org/index.php?action=process&city_name=Little+Grass+Valley%2C+CA&city=16000US0641789
• https://everysinglemonth.org/index.php?action=process&city_name=Willow+Canyon%2C+AZ&city=16000US0483475
• https://everysinglemonth.org/index.php?action=process&city_name=Hobart+Bay%2C+AK&city=16000US0232550
• https://everysinglemonth.org/index.php?action=process&city_name=Monowi%2C+NE&city=16000US3132550

The software should notice that it doesn't have values that it needs, and then either try to query the API again, or fail gracefully, and then push a notification to the dev using push(). Right now it proudly shows a city with zeros everywhere.