F file read error

Summary

See #30 (closed). Having an empty path for the certificate leads to a vanilla basic iostream error

Focus

The basic exception is caught and changed into a slightly more precise Exception with error code.

Test Environment

e.g. set cert path to empty string and try to connect

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CHANGELOG.md

@@ -15,7 +15,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 * Integer values are 32 bit now.
-* Rename UnkownConnectionError to ConnectionConfigurationError
 
 ### Deprecated