Exception at one station kills app

Mathias Bavay
2018-06-27T22:45:24Z

**This issue was reported by Simon Horton.**

Steps to reproduce the problem:
1. Have multiple stations in an ini file
2. Run snowpack app
3. One station has some type of issue that causes an exception (e.g. missing value, crazy temp, etc.)

Expected result: The app moves on to the next station

Actual result: Program aborts after the exception