Improve exception handling in jsonrpcclient

The `jsonrpcclient.py` file has two instances of generic exception handling. Generic exception handling breaks PEP 8 and can make debugging issues more difficult, especially since exceptions are suppressed.

Although we are logging exceptions, I recommend re-working this logic. If we choose to keep generic exception handling then we may at least consider simplifying instances of redundant code where repeat logic is used across different exceptions.