Add structured error handling

[RolandJansen]

There are some try/catch blocks with an empty catch block (which is really dangerous). Add some kind of redux error action that collects error objects in the store (or sth).

[RolandJansen]

Some of this try/catch stuff is redundant and is removed already. However, proper error handling is important and there should be a strategy for system wide error handling.

[RolandJansen]

Removed the try/catch stuff. It's not needed in a synchronous system. Functions that did throw now return undefined or another value that can be handled by the application.